go to the mpre workshop on this page and listen to the presentation on how to answer multiple choice questions. Although the focus of that presentation is the MPRE exam and not the MBE, the strategy works for any multiple choice question.
go also to blogs.law.siu.edu/success and watch the presentation on multiple choice questions. Although this presentation is focused on 1L courses, it also teaches the same strategy for how to attack a multiple choice question.