A small question, it's correct to eliminate attempts to obtain greater accuracy for the score?
It won't affect your position in the high scores.
The idea is to get 90% a few times on each lesson, then move onto the next lesson, though some people move on as soon as they get a single 90% correct.
Generally you need to try to get through to the end of lesson 40 before you loose interest.
Of more concern should probably be the speeds at which you are running the courses . . . .