Yes — for the math the ACT asks about, not for the test itself. Brilliant teaches most of the algebra, functions, number, and statistics content described by ACT’s math standards, and it teaches it by making you solve problems rather than watch explanations. It does not teach the exam: no format walkthroughs, no timing strategy, no full-length practice tests. The honest split is that Brilliant is the understanding layer and ACT’s official materials are the exam layer, and a good ACT plan uses both.
What does the ACT math section actually test?
ACT publishes its College and Career Readiness Standards in six strands — Number and Quantity, Algebra, Functions, a combined Algebra and Functions strand, Geometry, and Statistics and Probability — and sorts the standards inside each strand by the ACT score range at which students typically demonstrate them, from 13–15 up to 33–36. A score range is a difficulty band, not a grade level: familiar content can sit high in the bands because the ACT asks a harder question about it. ACT sets its College Readiness Benchmark for mathematics at 22.
Geometry is the largest of the six strands, and the ACT leans on plane geometry more than the digital SAT does.
One thing no amount of concept work replaces: the math section is 60 questions under a tight time limit. Pacing is its own skill, and you can only build it on timed, full-length official material.
Which of that math does Brilliant teach?
Most of it, across more than thirty courses. The strongest overlap is in algebra and functions, where Brilliant’s catalog is deepest.
- Algebra. Solving equations from balance-scale reasoning in Solving Equations, expressions with negative coefficients in Linear Expressions & Equations, expanding and factoring binomials in Quadratics, and exponent rules and radicals in Exponents & Radicals, including Any Fraction as an Exponent.
- Functions. Function rules, input–output pairs, and graphing in Introduction to Functions; domain, range, and asymptotes in Equations & Curves; growth, decay, and logarithms in Exponential Functions; the unit circle, radians, and tangent in Trigonometric Functions.
- Number and quantity. Distance and absolute value on the number line in Negative Numbers, prime factorization and powers of ten in Exponents & Radicals, complex numbers in Complex Plane, and matrices and vectors in Vectors & Matrices.
- Statistics and probability. Counting outcomes and AND/OR probability in Probability and Chance, mean, median, and mode in Everyday Statistics, and reading charts and graphs in Exploring Data Visually.
The standard-by-standard version of this, band by band, is on the ACT math coverage page.
Where is Brilliant strongest for the ACT?
In the 24–32 range, which is where most students who already clear the benchmark are trying to move. Exponents & Radicals (83 lessons) matches more ACT standards in the 24–27 band than any other course, and Equations & Curves — 61 lessons, 52 skills matching this exam, more than any other Brilliant course — leads the 28–32 band. At the very top, Trigonometric Functions carries the 33–36 band almost single-handedly, with Polynomials and Polar Coordinate Plane behind it.
What will you not get from Brilliant?
Geometry is the real gap, and it matters more on the ACT than on other tests. Brilliant has no dedicated high-school Geometry course. It reaches ACT geometry through coordinate work, transformations, right-triangle trigonometry, and vectors — the Pythagorean theorem, the distance formula, trigonometric ratios, circle area and circumference, and rotations and reflections are all taught. What is missing is the routine plane-geometry layer the ACT keeps asking about: the midpoint of a segment, angles formed by parallel lines cut by a transversal, isosceles triangle side and angle relationships, perimeter when every side length is given, multi-step area problems, recognizing 3-4-5 and 6-8-10 style triples on sight, and unit conversions like inches to feet or hours to minutes. Get those from your geometry textbook or a prep book; they are quick to learn and heavily tested.
A few non-geometry topics are also worth picking up elsewhere: sequences defined recursively, interpreting function notation in context, the remainder theorem, matching inequalities to their number-line graphs, reading slope directly off an equation, and the arithmetic and place-value questions low in the score bands.
What should you study, and in what order?
Work the band you are trying to reach, not the whole catalog. Find your math score on a practice test, start one band above it, and move up a band at a time — skipping ahead rarely works, because the higher bands ask harder questions about the same objects.
| If you are aiming for | Work on | Start here |
|---|---|---|
| Under 20 | Fractions, negative numbers, percentages, evaluating linear expressions, reading charts | The Number Line |
| The benchmark, around 20–23 | Writing and solving equations, growth patterns, distance and absolute value, basic probability, points on the coordinate plane | Finding Unknowns |
| 24–27 | Exponents and radicals, quadratic expressions, function rules, domain and range, forms of a line, polynomial graphs | Square Roots |
| 28–32 | Exponential growth and logarithms, complex numbers, vectors and matrices, systems, intersections of curves | Growing |
| 33–36 | Radians and the unit circle, tangent, polar coordinates and arc length, polynomial sign behavior, distributions and regression | The Unit Circle |
If you are short on time, do three things and drop the rest. Fix your geometry formulas from a prep book, since that is the fastest scoring gain and Brilliant will not do it for you. Spend your Brilliant time only on the band immediately above your practice-test score. And open individual lessons rather than completing courses — Brilliant lessons are short and stand on their own, so you can go straight to the topic that cost you points.
What should you use from ACT itself?
ACT publishes free official practice tests with answer explanations on act.org, and sells The Official ACT Prep Guide. Use them for everything Brilliant does not do: the shape of the test, the way questions are worded, and above all full-length timed sections. Sixty questions against the clock is a skill you can only build by doing it, and doing it on real ACT material.
A workable rhythm is to alternate: take a timed official section, list what you missed for a math reason rather than a timing reason, then use Brilliant on exactly those topics before the next one.
Is Brilliant a complete ACT prep course?
No. Brilliant is not an ACT prep course, is not affiliated with or endorsed by ACT, and does not include practice tests, timing drills, or score guarantees. It teaches the mathematics the ACT is testing you on. Use Brilliant for the math and ACT’s official materials for the exam, and you have both halves.
How this mapping was made
Brilliant’s curriculum team maps skills to ACT’s College and Career Readiness Standards skill by skill against the live course catalog. The data behind this page was pulled on August 27, 2026 and reflects the catalog on that date.
Frequently asked questions
Should I use Brilliant for the ACT or the SAT?
Both draw on the same underlying math, and Brilliant’s algebra and functions courses serve either one. See Can Brilliant help you prepare for the digital SAT?.
How far ahead of the test should I start using Brilliant?
Far enough that concept work is not competing with timed practice. Brilliant is best in the stretch where you are still learning math you do not know; in the last few weeks, timed official sections and error review are the better use of your hours.
Does Brilliant cover ACT trigonometry?
Yes, and it is one of the strongest areas for a high scorer. Trigonometric Functions covers radians, the unit circle, converting between degrees and radians, evaluating sine and cosine at standard angles, and tangent as both a slope and a ratio.
I am scoring below the benchmark. Where do I start?
Not with trigonometry. Start with Solving Equations and Linear Expressions & Equations, which carry most of the 16–23 bands, then add Probability and Chance and Exploring Data Visually for the data questions.
Related resources
- ACT math coverage: Brilliant lesson mapping by score range
- Can Brilliant help you prepare for the digital SAT?
- Does Brilliant cover Geometry?
- What math does Brilliant cover?
- Explore Brilliant’s courses
Sources
[1] ACT, official practice tests, answer explanations, and The Official ACT Prep Guide, act.org, accessed August 2026. [2] Brilliant, standards alignment database, skill hierarchy version 397, pulled August 27, 2026. [3] Brilliant, “ACT math coverage: Brilliant lesson mapping by score range”, accessed August 2026. [4] Brilliant, “Courses”, accessed August 2026.
