About
We don't make things up.
Keiko is prep for the GRE, its subject tests, and the GMAT. The study notes are free and every fact links to where it came from. No fake reviews, no score guarantees, no stats borrowed from other sites — just the material and honest tools.
What we stand for
Every fact names its source
Exam facts and formulas link to where they came from — the test maker's own docs or a standard textbook — right next to the claim. If something is still being built, the page says so.
Answers checked properly
When you practice, we check your answer on our side, so the answer key isn't sitting in the page for you (or a script) to peek at. You get the result and the full reasoning.
How sure vs. how right
Say how confident you are before you check an answer, then see that against how often you were actually right. It's a mirror on your prep, not a predicted score.
Nothing faked
No invented reviews, no stats borrowed from other sites, no “raise your score by X” promises. The only numbers you see come from your own attempts.
Where things stand
We'd rather show the gaps than hide them. Not every exam has the same depth of notes or practice — where something is thin, the page tells you, instead of pretending it's a premium feature. Everything here was checked by the people who wrote it, with an automated pass over every answer key; no outside expert has reviewed it. The AI tutor is a Pro add-on and needs you to connect your own ChatGPT account.