AP & IGCSE CS · KOAI AI Olympiad
Minimum study time. Maximum marks.
We pinpoint exactly where your child stands, then turn it into strategy: a skill model picks each question, memory science schedules each review right before forgetting, and AI gives feedback on every answer. Minimum wasted time, maximum retained knowledge, and you watch it all in the parent dashboard.
Free to start · No credit card · English & 한국어
Built on published learning science
- Ebbinghaus forgetting curve
- Spaced repetition · FSRS
- Item Response Theory · M-Elo
- GPT-4o feedback
Pick your exam
Every question bank is built to its official course description and organized by its real units.
What's covered
42 MCQ · 90 min · Java
What you get
- Timed mock exams with an AP score estimate
- AI-graded FRQs against official-style rubrics
- Line-by-line code trace on every snippet
What's covered
70 MCQ · 120 min · Pseudocode
What you get
- Exam-format pseudocode practice
- Scaffold-to-exam difficulty tiers
- Full-length timed mock exams
What's covered
Paper 1 & 2 · 40 MCQ · 60 min
What you get
- Past-paper style question bank
- Mark-scheme explanations on every question
- Predicted grade after each mock
What's covered
30 Q · 120 min · Python
What you get
- Middle and high school divisions, each with its own topic scope
- Written-response questions with model answers
- Full-length mocks scored like the real exam
Try a real question
Straight from the question bank. No signup needed.
AP CSA question bank · Casting
What is printed as a result of executing the code segment?
int a = 13;
int b = 3;
double c = (double) a / b;
int d = (int) (c * 5);
System.out.println(d);- Step-by-step explanations
- Line-by-line code trace
- AI hints that target the mistake
1,800+ more questions inside.
Start freeProof, not promises.
The parent dashboard answers the three questions that matter: where is my child now, what needs attention, and is the effort trending the right way.
Five key metrics
Accuracy, pace, streak, mastery, and momentum, updated after every session.
Teacher, connected
Homework, comments, and session plans from your child's teacher, all in one place.
D-day plan
Exam countdown with phase-by-phase focus and the exam-day readiness checklist.
In your language
The full dashboard reads naturally in English and Korean.
Weekly Report
Mon–Sun- Questions solved
- 126+18%
- Accuracy
- 74%+6%p
- Study time
- 4h 20m+35m
- Topics mastered
- 11+2
Focus next week: Recursion
Practice that actually sticks
Six systems working together, so studied once means remembered on exam day.
Adaptive difficulty
M-Elo, an Item Response Theory model, keeps every question inside your 55-80% success zone: hard enough to learn from, never hopeless.
- Skill rating per topic and misconception
- Four difficulty tiers, scaffold to challenge
- “Fix next” recommendation after every session
Serious prep. Visible progress.
Set up in two minutes. Your child practices, you see everything.
Free to start · No credit card required
For parents
See every session, every score, and every teacher note, as it happens.
For students
Questions at your level, reviews before you forget, help when you're stuck.
For teachers
Assign homework, watch progress, and step in exactly where it's needed.