JY

Keep your PDF open, ask right there, and note it down.

A Windows app for people who study with exam papers and textbook PDFs.

Getting started →

Ask your PDF directly

Ask about the page you are looking at, and JY reads that page to answer. Every answer shows which page it came from.

A notebook per subject

One notebook per subject. Write down what you study as you would in a real notebook, and let AI help you organize and analyze it. You can ask questions while reading your notes, too.

Results on real exam papers

Solved with JY 0.54.2 · other versions

University entrance exams

  1. SAT official practice tests

    240/240

    100%

    two practice tests, reading and writing plus math

    All right

    Web search off

    240/240

    100%

  2. CSAT 2026 (Korea)

    245/247

    99.2%

    Korean, math, English, Korean history and four inquiry subjects

    2 wrong: English Q37, Society and culture Q8

    Web search off

    245/247

    99.2%

  3. KICE September mock for 2027 (Korea)

    504/507

    99.4%

    every subject except second foreign languages, Classical Chinese and vocational inquiry

    3 wrong: Korean (common) Q8, Ethics and ideas Q12, Society and culture Q9

    Web search off

    502/507

    99.0%

  4. Japan Common Test 2026

    625/627

    99.7%

    26 subjects: Japanese, geography and history, civics, foreign languages (reading), math, science, information · 17 questions whose material the public PDF omits are not counted

    2 wrong: Japanese Q17, French Q5

Professional exams

  1. PSAT grade 5, 2026 (Korea)Medium

    145/145

    100%

    verbal logic, data interpretation, situational judgement and constitutional law

    All right

  2. LEET 2027 (Korea)Medium

    70/70

    100%

    reading comprehension and logical reasoning

    All right

Setup
Exam PDF opened as it is, then asked
AI
GPT-6.1 Sol Medium; professional exams show theirs beside the name
Web search
auto; off results on the second line
How it was asked
one request per subject
Date
Oct 12, 2026
Grading
checked against the official key (answers only)

Answers were checked against the official key. Other material may give different results.

Three things to know before you start.

  • You need a Windows PC and your own ChatGPT account.
  • Questions to the AI use your own ChatGPT plan’s usage.
  • Your PDFs and notes are stored only on the PC where you use JY.

First steps in detail →Using it well →FAQ →