Before you go to the next question, you must choose one of four symbols at the bottom. The symbols mean: ◎ = I can do it very well, ◯ = I can do it, △ = I’m not sure if I really can. X = I can not.

 
 

The selection of the symbol decides in which box the answered question is sorted. The further to the left the question is sorted, the more frequently it appears again.