What level of education have you reached?
What level of education did you reach?
Did you go to university?
What is your highest level of education?
I gave those suggestions based on your suggested (but incorrect) questions. None of them means "How much have you studied?" The answer to that would be in hours or days or something similar.
Are you ready for your exam?
I think so.
How much have you studied?
I studied all day for the last three days and last night I stayed up all night revising.
Student or Learner