Find out what you actually know

Rate your confidence before every exercise. The distance between that rating and your score is the thing worth studying.

Anything can tell you your score. Whetstone tells you how well you saw it coming.

1. 1

   Predict

   Say how you think it will go, before you see a single word of the exercise.

2. 2

   Attempt

   Your rating locks. No hints, no going back, no editing it afterwards.

3. 3

   Compare

   See your prediction beside your score, and the gap between them.