United States · Grades 7 to 12 · Stanford Online High School

Stanford Online High School math prep

Stanford Online High School is unusual in two ways that matter for math. It places students in a math course by what they know, not by their grade, and its math program puts written proof at the center. So the honest preparation is not a trick for an entrance test; it is solid algebra and geometry, and the habit of explaining why an answer is true. This guide sets out the OHS math sequence from its own 2026-27 catalog, the 2027-28 admission timeline and testing rules, and original practice in the style of thinking OHS asks for.

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In short

Stanford Online High School is a selective online school for academically advanced students in grades 7 to 12. It places students in math by demonstrated content knowledge, runs a sequence from Prealgebra to university-level courses with a strong focus on proof, and takes 2027-28 applications until January 7, 2027. Modern Age Coders is not connected with Stanford. We teach the algebra, geometry and proof-writing that sequence builds on, live online in our high school mathematics course, as a group of 15 to 20 or one to one.

Math that is ready for OHS

Three courses that build OHS-ready math

Each one aims at understanding and clear written reasoning, the two things a proof-focused program expects.

High School Mathematics course thumbnail

STHI / 01

High school math, algebra to calculus

The full sequence, taught with reasons, for grades 9 to 12.

Open the syllabus →
Middle School Mathematics Mastery course thumbnail

STHI / 02

Middle school math mastery

Pre-algebra and geometry for grade 6 to 8 applicants.

Open the syllabus →
Maths Olympiad & Competition Course course thumbnail

STHI / 03

Olympiad and competition math

Problem solving and proof beyond the school syllabus.

Open the syllabus →

Stanford OHS

What is Stanford Online High School, and who is it for?

Stanford Online High School is an online middle and high school run by Stanford University. Its admissions FAQ says it serves academically advanced students in grades 7 to 12, and its criteria page says plainly that admission is competitive.

Admission, in the school's words

The Acceptance Criteria page says "Admission to Stanford OHS is competitive" and that, to keep classes small, "we are unable to accept all qualified applicants". The committee reviews each application holistically, and "no one item is the deciding component".

For younger students, the school says it typically encourages students "to apply for grade 7 when they are in grade 6 or ages 11 to 12".

Three ways to enroll

Stanford OHS offers three enrollment levels. Full-time students take 4 to 5 yearlong courses; part-time students take 2 to 3; a single-course student takes "1 yearlong course or 2 semester-long courses".

The school estimates "8-10 hours per week, per course" for a high school course. Many families start with a single math course while staying at their current school; one of the admission decision types is even "Admission Restricted to Mathematics/Science or Humanities".

Sources: Stanford OHS Acceptance Criteria and Enrollment Options, read 31 October 2026. Stanford and Stanford Online High School are names of Stanford University. Modern Age Coders is an independent online school with no connection to Stanford University or Stanford OHS, and we make no admission promise of any kind.

Math sequence

What math courses does Stanford OHS offer, and in what order?

The 2026-27 OHS catalog lists a math ladder from Prealgebra to university-level analysis, each course with a stated prerequisite. The school says it places students "by age, grade level, and demonstrated content knowledge", so a strong grade 8 student may start well up the ladder.

Stanford OHS math courses and prerequisites, high school stage (Stanford OHS Course Catalog 2026-27, Mathematics, read 31 October 2026)
Course (code)LevelPrerequisite as published
Prealgebra (JM007)Middle schoolNone listed
Beginning Algebra (OM011)High schoolPrealgebra (JM007)
Intermediate Algebra (OM012)High schoolBeginning Algebra (OM011)
Geometry and Foundations of Proof (OM015)High schoolBeginning Algebra (OM011)
Precalculus with Trigonometry (OM013)High schoolIntermediate Algebra (OM012) and Geometry and Foundations of Proof (OM015)
Single-Variable Calculus (OM045)High schoolPrecalculus with Trigonometry (OM013)
Advanced Problem Solving and Proof Techniques (OM050)High schoolPrecalculus with Trigonometry (OM013)
Statistics and Data Analysis (OM061)High schoolPrecalculus and Trigonometry (OM013)

Beyond calculus

The catalog continues into university-level courses: Multivariable Calculus (UM150), Linear Algebra (UM51A), Number Theory (UM152), Discrete Mathematics (UM160), Real Analysis (UM115), Complex Analysis (UM106) and research seminars.

For Multivariable Calculus the stated route in is Single-Variable Calculus or Calculus C "with a grade of A- or better, or an AP Calculus BC Exam score of 4 or 5, or consent of instructor".

Two things to notice

First, geometry here is "Geometry and Foundations of Proof", and it sits before Precalculus. Proof is not an extra at OHS; it is on the main road.

Second, the catalog says the school has "replaced all of our Advanced Placement (AP) courses with custom courses" and that students can still sit AP Exams locally. Preparation should aim at understanding, not at one exam's format.

Source: Stanford OHS Course Catalog 2026-27, Mathematics filter, and the OHS Mathematics page, read 31 October 2026. Course titles and codes are the school's; check the live catalog before planning.

Dates and testing

When is the Stanford OHS deadline, and is a test score required?

For entry in the 2027-28 school year, the application deadline is January 7, 2027, at 11:59 pm Pacific Time. A standardized test score is required only for some applicants, mainly those who were homeschooled recently.

Stanford OHS 2027-28 admission timeline (How to Apply page, read 31 October 2026)
StepDate as published
Deadline to apply if you want the optional online interviewNovember 11, 2026, 11:59 pm Pacific Time
Application deadline (standard timeline)January 7, 2027, at 11:59 pm Pacific Time
Decision notificationMarch 2027
Enrollment contract due10 days after decisions are released

Who must send a test score

The Acceptance Criteria page requires a score from an approved test for applicants who were homeschooled, or attended a school taught in a language other than English, between September 2024 and December 2026. The test must be taken between September 2025 and December 2026.

For everyone else a score is optional, and the school says that if sent "there will be no advantage in the evaluation process".

Which tests, by grade

OHS suggests the Middle SSAT or ISEE, PSAT 8/9 or PreACT 8/9 for grade 7 to 8 applicants; the Upper SSAT or ISEE, PSAT 8/9, PreACT 8/9 or PSAT 10 for grades 9 to 10; and the PSAT, PreACT, SAT, ACT or PSAT 10 for grades 11 to 12.

Applications also need "at least two recommendation forms (one Humanities/Social Science teacher and one Mathematics/Science teacher)". A homeschooled applicant can ask any adult who has taught them math.

  1. Summer and early fall 2026 (our suggested order). Read the OHS math catalog and decide which course your child is realistically ready for.
  2. By early fall 2026. If a test is required, book one from the permitted list for a date before December 2026.
  3. By November 11, 2026. Submit early if you want the optional online interview.
  4. Before January 7, 2027. Make sure both recommenders, including the math or science one, have submitted their forms.
  5. March 2027. Decisions arrive; the enrollment contract is due ten days later.

Sources: Stanford OHS How to Apply and Acceptance Criteria, read 31 October 2026. The school also says "All responses, essays, and work submitted in the application must be the student's own." We never write or edit any part of an application.

Proof

How do you prepare for proof-based math like Stanford OHS?

By practising short, complete arguments early. The OHS Mathematics page names a "Focus on Proofs" and says "Proof-writing enables students to present clear and logical mathematical arguments." Here is a first proof, worked in full. It is ours.

Notice a pattern (ours)

Add the odd numbers in order: 1 = 1, 1 + 3 = 4, 1 + 3 + 5 = 9, 1 + 3 + 5 + 7 = 16. Every total is a perfect square. A student who stops here has a guess, not a proof.

The claim to prove: the sum of the first n odd numbers is n squared. For n = 10, that predicts 1 + 3 + ... + 19 = 100, and adding them confirms it.

Prove it (ours)

The k-th odd number is 2k - 1. Pair the first and last terms: 1 + (2n - 1) = 2n. The second and second-to-last also make 2n, and so on. There are n terms, so n / 2 pairs, each worth 2n, giving (n / 2) x 2n = n squared.

If n is odd the middle term has no partner, but the same total comes out by writing the sum forwards and backwards: twice the sum is n terms of 2n, so the sum is n squared. Either way the claim holds for every n.

The three parts of a short proof, shown on a second example (ours)
PartWhat to writeExample: odd x odd is odd
ClaimState exactly what is trueThe product of two odd numbers is odd
Set-upName things with lettersLet the numbers be 2a + 1 and 2b + 1 for whole numbers a and b
ReasonsEach line follows from the last(2a + 1)(2b + 1) = 4ab + 2a + 2b + 1 = 2(2ab + a + b) + 1
ConclusionSay why the claim followsIt is 2 times a whole number, plus 1, so it is odd

Notice what a proof is not: checking 3 x 5 = 15 and 7 x 9 = 63 shows examples, but only the letters cover every case. That shift, from examples to every case, is the habit to build before a course like Geometry and Foundations of Proof.

Practice

What math should a student master before applying?

Whatever course a student hopes to enter, the course before it should feel secure. This self-check and practice set are ours, written at the Beginning Algebra to Precalculus level, with answers checked in Python.

A readiness self-check (ours, not an OHS placement rule)
If your child can confidently...They are probably ready to work on...
Work with fractions, ratios and negative numbersBeginning algebra
Solve linear equations and graph linesIntermediate algebra and geometry with proof
Factor quadratics and write short proofsPrecalculus with trigonometry
Use functions, logs and trigonometry fluentlySingle-variable calculus and proof techniques
Seven practice problems with answers (ours; checked in Python)
ProblemA good way inAnswer
Solve 3(x - 4) = 2x + 5Expand, then collect x on one sidex = 17
Factor x squared - 5x + 6Two numbers with product 6 and sum -5(x - 2)(x - 3)
Slope of the line through (1, 2) and (4, 11)Rise over run: 9 / 33
A right triangle has legs 5 and 12. Hypotenuse?25 + 144 = 16913
1 + 3 + 5 + ... + 19Ten odd numbers, so 10 squared100
sin 30 degreesHalf an equilateral triangle1/2
Prove odd x odd is oddWrite odds as 2a + 1 and 2b + 1See the proof above
  1. Weeks 1 to 4 (ours). Close gaps in the course below the target: one topic a week, with written explanations, not just answers.
  2. Weeks 5 to 9. Proof habits: even and odd, divisibility, simple geometry facts. One short proof every lesson.
  3. Weeks 10 to 12. Problem solving: multi-step problems that need a plan, written up neatly as if for a teacher who was not in the room.
  4. Weeks 13 to 16. Work through problems at the level of the target course and read the OHS course description for it on the catalog.

Related help: algebra 2 tutoring, precalculus tutoring, calculus tutoring and, for younger applicants, accelerated math online.

Where your child is

Four stages of mathematical writing

Our own description of how students grow from answers to arguments.

Stages of explaining math (ours)
StageWhat it looks like
1. Answer onlyWrites the final number, often correctly
2. Shows workingLists steps, but not why each is allowed
3. Gives reasonsEach step is justified by a rule or fact
4. Proves in generalUses letters to cover every case and says why the claim follows

For parents

Many strong students sit at stage 2 because school never asked for more. Moving to stage 3 is the single most useful step before a proof-based course.

Ask your child to explain one solution aloud each week. If they can say it, they can learn to write it.

For students

Write every proof for a reader who was not there. If a step needs you to explain it out loud, write that sentence down.

Examples suggest; letters prove. Try your idea with numbers first, then with a and b.

The catalogue

Math courses for grades 6 to 12 and beyond

Live courses that follow the same order the OHS ladder does, from pre-algebra to university topics.

I

Foundations

Grades 6 to 8
II

High school

Grades 9 to 12
III

Beyond calculus

Advanced students

How lessons run

Live math lessons that ask for reasons

Weekdays or weekends, flexible: choose your batch, or for a very personalised plan choose 1-on-1 at your convenience, weekend mornings or weekdays.

Weekdays

Evening lessons after the school day.

Weekends

Longer sessions for proofs and problem sets.

1-on-1

For a student working well above grade level.

Why, not just how

Every method comes with its reason.

Written arguments

Short proofs most weeks.

Our own problems

Never copied from any school.

Feedback on writing

Teachers mark the reasoning.

No admission promises

We teach math; the school decides.

Group or private

Fifteen to twenty, or one to one.

Student work

Work from our high school students

Math investigations and code from older students in our classes. Browse student labs for more.

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Questions from families

Stanford Online High School math: questions answered

What math courses does Stanford Online High School offer?

The 2026-27 catalog runs from Prealgebra through Beginning and Intermediate Algebra, Geometry and Foundations of Proof, Precalculus with Trigonometry and Single-Variable Calculus, then university-level courses such as Multivariable Calculus, Linear Algebra and Real Analysis.

How does Stanford OHS place students in math?

The school says it places students in courses by age, grade level and demonstrated content knowledge. Each course in the catalog lists a prerequisite, so the course before the target should be secure.

When is the Stanford OHS application deadline for 2027-28?

The How to Apply page gives January 7, 2027, at 11:59 pm Pacific Time. Families who want the optional online interview must apply by November 11, 2026, and decisions are released in March 2027.

Does Stanford OHS require a test score?

Only for some applicants: those homeschooled, or at a school taught in a language other than English, between September 2024 and December 2026. For others a score is optional and, the school says, gives no advantage.

Is it hard to get into Stanford Online High School?

The school says admission is competitive and that it cannot accept all qualified applicants. It reviews applications holistically, so no single grade or score decides.

What grade can you start Stanford OHS?

Stanford OHS serves grades 7 to 12 and typically encourages students to apply for grade 7 while in grade 6 or aged 11 to 12.

Can my child take just one math course at Stanford OHS?

Yes. Single-course enrollment means one yearlong course or two semester-long courses, and the school estimates 8 to 10 hours a week for a high school course.

Does Stanford OHS offer AP Calculus?

The catalog says the school has replaced its AP courses with custom courses, such as Single-Variable Calculus, and that students can still register for AP Exams in their local area.

What times are your math classes?

Weekdays or weekends, flexible: choose your batch, or for a very personalised plan choose 1-on-1 at your convenience, weekend mornings or weekdays.

Are you part of Stanford?

No. Modern Age Coders is an independent online school and is not affiliated with Stanford University or Stanford Online High School. We teach math and never promise admission.

Elsewhere on this site

Related pages

More for advanced US math students.

Accelerated math online

Working ahead of grade level.

Precalculus tutoring

Functions and trigonometry.

Calculus tutoring

Limits to integrals.

Algebra 2 tutoring

The bridge to precalculus.

Middle school math competitions

Problem solving for younger applicants.

Homeschool math curriculum

For homeschooled applicants.

Related pages in this guide

Part of the guide: US gifted and selective school tests

Programs for advanced students

Gifted and talented screening

Exam schools and private high schools

More guides: US state math tests by state · US math placement and college readiness tests · Homeschool and school math curricula guide · US math and coding competitions guide

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Tell us your child's grade, the last math course they finished and which OHS course they are aiming for. The teacher will check what is solid.

It may help to read how our teachers work or scan the full catalogue beforehand.

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