I am not a teacher.
It is clear what you want to say but "mostly" isn't the adverb you're looking for. What I think you mean by "mostly" is "as much as possible". In fact, at the end of your post you say "…as most as possible" which shows the same mistaken use of the word "most".
Why not try "accurately" or "successfully" instead of "mostly"?
Student or Learner