№ 01All tiers
AI Examiner marks your working
Show your steps. Our model grades line by line against the official SAT and ACT rubrics — not just final answers.
Chapter I→
EST. 2024 · USA · MMXXVI
Preparation worthy of the
score you want.
The SAT and ACT math prep that actually marks your working — every step, every question, every paper since 2016. Built for the test you actually take.
27topics
+150 / +4SAT / ACT average lift
4.9★from 812 students
№ IEverything for your SAT & ACT
The platform that replaces the eight tabs you usually have open.
№ 02All tiers
Weak-Spot Radar
After every session, see the three topics quietly costing you the most points. Drill them before they cost you on test day.
Chapter II→
№ 03All boards
Exam Simulator
Every released SAT and ACT math paper from 2016 to 2025, plus AI-generated papers, marked like the real thing.
Chapter III→
№ 04Signature
Ask the Margin
Highlight any phrase mid-question. Get a tutor-style explanation in seconds — no leaving the page, no losing focus.
Chapter IV→
№ 05All tiers
Score Tracker
XP, streaks, and a running predicted SAT/ACT score. Watch the number move with every question you answer.
Chapter V→
№ 06Free PDF
Formula Sheet
The complete reference — algebra, geometry, trig, statistics, plus ACT-only law of sines, conics, and 3D geometry.
Chapter VI→
№ 07Signature
Test-Day Planner
A 15-minute daily revision plan calibrated to your test date and weak spots. No guessing, no spreadsheets.
Chapter VII→
№ 08Signature
Working Pad
Type or sketch your working. The AI reads it, marks it, and shows you what the examiner would actually do with it.
Chapter VIII→
№ IIThe full stack
One destination. Nothing left to find elsewhere.
№ 01
Khan Academy
Free videos and a handful of practice questions. No marked working, no past paper archive, no predicted score.
№ 02
Princeton / Kaplan
Big books and pre-recorded courses. The questions are good. The feedback loop is days, not seconds.
№ 03
Private tutoring
Excellent — at $80 to $200 an hour. We give you the same line-by-line marking for the price of a textbook.
One subscription. The notes, the practice, the past papers, the marking, the planner, the formula sheet. Done.
№ IIIThe number that moves
Your predicted score, recalculated every single question.
Every answer feeds a Bayesian estimate of your test-day score. You will see a 400 to 1600 for SAT and a 1 to 36 for ACT, with the confidence interval shrinking as you practice. The number moves. So do you.
Predicted score · today
SAT Math
780
+40 this week
ACT Math
33
+2 this week
Confidence interval
№ IVMethod marks
The only AI that marks your working, not just your answer.
Your working
3(2x − 4) + 5 = 2x + 9 6x − 12 + 5 = 2x + 9 6x − 7 = 2x + 9 4x = 16 x = 4
The AI examiner
- ✓Distribution correct — you expanded 3(2x − 4) cleanly.
- ✓Like terms combined on the left.
- ✓Isolation of x on one side. Method mark earned.
- ✓Answer matches the official rubric: x = 4.
- ↳Time: 38s. Average for this question: 52s.
Weak spots · this week
- № IQuadratic Equations18 marks lost · 6 questions
- № IIRatios, Rates & Proportions14 marks lost · 5 questions
- № IIIGeometry: Lines, Angles & Triangles10 marks lost · 4 questions
№ VThe Radar
Find the three topics holding your score back.
After every session, three topics — never more — get flagged. They are the ones costing you the most marks, weighted by frequency on real papers. The planner schedules them. You revise. You stop losing points.
№ VIThe archive
Every past paper, marked like the real thing.
2016 through 2025, SAT and ACT, every released math section. Plus AI-generated papers calibrated to the same rubric.
№ 01SAT
SAT 2016 · Test 1
70 min · 44 Q
№ 02SAT
SAT 2016 · Test 2
70 min · 44 Q
№ 03SAT
SAT 2016 · Test 3
70 min · 44 Q
№ 04SAT
SAT 2017 · Test 1
70 min · 44 Q
№ 05SAT
SAT 2017 · Test 2
70 min · 44 Q
№ 06SAT
SAT 2017 · Test 3
70 min · 44 Q
№ 07ACT
ACT 2016 · Test 1
60 min · 60 Q
№ 08ACT
ACT 2016 · Test 2
60 min · 60 Q
№ 09ACT
ACT 2016 · Test 3
60 min · 60 Q
№ 10ACT
ACT 2017 · Test 1
60 min · 60 Q
№ 11ACT
ACT 2017 · Test 2
60 min · 60 Q
№ 12ACT
ACT 2017 · Test 3
60 min · 60 Q
№ VIIThe margin
Highlight anything. Get a tutor’s explanation.
Stuck on the word “discriminant”? Don’t know what an asymptote does in this problem? Highlight it. A clear, exam-shaped explanation appears in the margin — without you ever leaving the question.
The quadratic 2x² − 5x − 3 = 0 has a discriminant of 49. How many real roots does the equation have?
Margin · discriminant
The discriminant is b² − 4ac. If it’s positive, two real roots. Zero, one repeated root. Negative, no real roots. Here it’s 49 — positive — so two real roots.
№ VIIIThe tracker
Your score, tracked every session.
Current streak
12
days
XP earned
4,820
this month
Rank
Gold
Silver → Gold → Platinum
Questions answered
847
last 30 days
№ IXThe Method
Three principles that actually move scores.
i
Marked working
Final answers are not the lesson. Every step in your method earns its own mark, and you see why.
ii
Predicted score
A running 400–1600 SAT and 1–36 ACT estimate based on every question you have ever answered here.
iii
Spaced topics
The planner returns you to weak spots at the right interval, not just whenever you remember to revisit them.
№ XStudent Journeys
The scores speak for themselves.
“I went from a 1280 to a 1520 in just 6 weeks. The AI feedback showed me exactly where I was losing points.”
“The practice papers feel exactly like the real ACT. I walked into test day feeling completely prepared.”
“The instant marking is a game-changer. No more waiting for a tutor — I get feedback in seconds.”
№ XI · The invitation
Start tonight.
Thank yourself on test day.
8 strands. 27 topics. Every paper since 2016. One subscription. No credit card for the free tier.