I would say to think about what you may or may not be interested in. If you know there are any jobs in particular that you are already interested in, or are put off by, keep that in mind so that you have some idea of where you want to flock to during the fair. 

Another thing to keep in mind is that even though a particular subject may seen very off putting to you, do not just put it aside and never look further into jobs around that area. Just because you hate math doesn’t mean that there are no mathematical jobs you may find interest in. Keep an open mind to all fields of study.