What the heck? I meant that the timed practices gave you 30 seconds to do the practice, and it gave you a couple more seconds every time you got a question right, but the 30 seconds seems like 15. Interesting picture though.
Not sure. I don't like timed practice because since you are going so fast, you will probably overthink it or misspell it, and misspelling is usually marked as wrong. Also, if you can't type fast, you may only do a couple problems. These are just my problems with it though.