Save your 8 Bluebook tests for when they count.

15 full-length
SAT mocks.
Scored within
±20 of your real score.

  • 60-second sign-up
  • Take it on your schedule
  • Get your diagnosis the moment you finish
See how scoring works
Accurate
predictions
Deep
diagnosis
PRiSM
Your predicted SAT score
1560
Predicted Real SAT
+20 points accuracy
-20
Real SAT1560
+20
154015601580
Start your first mock free
60-second sign-up4 mocks freeNo credit card

You spent 2.5 hours on this mock.

You deserve a
score you can
trust.

An accurate score depends on three things.

Predicts within
±20
points of test day
1

Real-SAT-grade
questions

Calibrated to the actual exam's difficulty, topics, and question types.

2

Arranged like
the real SAT

Right difficulty mix, with adaptive Module 1 → Module 2 routing.

3

Graded like
the real SAT

Section-level scaling on the same 200–800 rubric the real test uses.

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Scored within ±204 mocks freeNo credit card
GETTING THE QUESTION WRONG ISN'T THE DIAGNOSIS.

Why you got it wrong is.

Every wrong answer falls into one of four reasons. We tell you which.

Ability

You haven't learned this concept yet —
or learned it shallowly.

FIXTargeted lesson + drill set.

Speed

You could solve it — but ran out of time before you got there.

FIXTargeted lesson, pacing drills.

Judgment

You knew it — but didn't spend sufficient time before answering.

FIXReview solution, pacing drills.

Careless

You knew it. You saw it right. And still mis-clicked or mis-read.

FIXReview protocol, checking habits.
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See your behaviour breakdownFull diagnosis includedNo credit card
THE LOOP, FULLY TOOLED

Take a mock. Make it count.

Between every mock and the next, Prism gives you the tooling to diagnose every miss, learn what's missing, and prove the gap is bridged.

1
START
Take a Mock
Full-length,
test-day UI
THE TOOLING BETWEEN
ATTEMPTS TABLE

Every miss tagged.
Every win timed.

Each question gets one of four behaviours — Ability, Speed, Judgment, or Careless — so you stop guessing why a score slipped.

  • Per-question behaviour diagnosis
  • Your time vs. the median, side by side
  • Filter by result, behaviour, or difficulty
Attempts table
WALK-THROUGH SOLUTIONS

The how — not just
the answer.

Every solution starts with the concept, names the approach, then solves it step by step. Built to teach, not just to grade.

  • Concept → approach → solve
  • Eliminate-and-verify reasoning
  • Side-by-side question and solution
Walk-through solution
CUSTOM QUIZ

Prove the gap is
actually closed.

Build a short quiz on the exact weak topic, at the exact right difficulty, from a 4,000+ question bank. If you nail it, you're ready for the next mock.

  • Pick topics, set difficulty
  • Filter by unanswered, answered, or incorrect
  • 4,400+ Prism-built questions to draw from
Custom quiz builder
5
LOOP CLOSES
Re-test
Next mock
locks the gain in
Start your first mock free
Run the full loopTake it on your scheduleNo credit card
REAL-TEST FIDELITY

Take the mock the way
you'll take the actual test.

Every tool you'll use on test day is already in your hand.

Desmos calculator Highlight and annotate Cross-out Question navigator Adaptive routing Real-time breaks

Built-in Desmos calculator

Same Desmos you'll use on test day. Always one keystroke away.

Full graphing power.Plot functions, solve equations.
One-keystroke open.Same shortcut as the real exam.
Familiar tools.No new tooling to learn at the test centre.

Highlight & annotate

Mark passages, leave notes — and see them again in review.

Highlight with purpose.Mark key claims and evidence as you read.
Leave a note.Add quick reasoning your future you will thank.
Find it fast in review.Your annotations sync to the per-question review.

Cross-out (ABC mode)

Eliminate answer choices with a click. Undo per question.

One-click eliminate.Strike through obvious wrong choices.
Per-question state.Each question keeps its own cross-out memory.
Undo any time.Restore a crossed-out choice in a click.

Question navigator

Jump questions, flag for review, see status at a glance.

Jump to any question.Move freely inside the module.
Flag for review.Mark anything you want to revisit before time.
Status at a glance.Answered, unanswered, flagged in one view.

Module-adaptive routing

Module 2 difficulty adjusts to your Module 1 performance — like the real exam.

Real adaptive logic.Module 2 difficulty matches your Module 1.
Section-level routing.R&W and Math route independently.
Score reflects the route.Hard-question accuracy is weighted, not just totals.

Real-time breaks

Per-module timer, the 10-minute break, and section-end warnings.

Per-module timer.Identical to the on-screen test-day timer.
10-minute break.The same break flow between sections.
End warnings.Section-ending alerts so nothing surprises you.
Start your first mock free
Try the test-day UI60-second sign-upNo credit card
STILL DECIDING?

Ask the
questions that
actually matter.

Bluebook tests are limited. Prep time is limited. Here's what students want to know before starting with PRiSM.

  • 4 mocks free
  • Full diagnosis included
  • No credit card
Start your first mock free
SCORE ACCURACY How is ±20-point accuracy actually possible?
Our scoring engine uses real SAT-style difficulty weighting, module routing, and section scaling — so predicted scores stay close to test-day outcomes.
TEST EXPERIENCE Will it feel like the real Digital SAT?
Pixel-faithful Bluebook recreation — same dark header, per-module timer, navigator, cross-out, highlight tools, and 10-minute break flow.
WHY PRISM How is this different from Khan Academy or generic prep apps?
Khan teaches content. Prism diagnoses behaviour — per-question, naming whether you missed on ability, speed, judgment, or care — and loops you through the exact fix.
FREE TRIAL Can I take a mock for free before deciding?
Yes. Your first full-length mock, the predicted score, and the full diagnosis are free. No credit card required.
IMPROVEMENT What if my scores aren't improving?
If your trajectory stalls across two mocks, our team reviews your behaviour data and adjusts the plan. Improvement is the contract.