Studentlearning style can be determined through learningstyles questionnaire or inventories given early in theyear.
I feel like this is an undertaking in itself. Our school is an AVID school, and part of what they have to do is "discover" their own learning styles and make their own study guides for tests...and almost none of them automatically know what type of learners they are! One of my students said she is a kinesthetic learner (because she wants to get up and run around) but in reality, she can recite anything she hears but can't recall what I put on the board.