Show it your work, typed or a photo of your handwriting, and it teaches you exactly what you got wrong.
This is how I went from a 65 to a 97 in calculus in two weeks. — Amogh V.
Photograph it with your phone. Type it for biology and anything wordy.
Beyond multiple choice: your understanding gets measured in one of four colors
It points out what went wrong, then teaches until it clicks.