If past exam questions are available, I think you should at least look them over.
Literal
Past-exam-questions [subject-が] if exist [conditional-ならば] just-in-case look-through [better-ほうがいい] [quotative-と] think.
過去問 is an abbreviation of 過去問題 ('past exam questions') — standard student vocabulary. 目を通す ('to pass one's eyes over, to skim') is a set expression for looking through material without deep study. 一応 ('just in case, at least') hedges the advice. ~ほうがいいと思います is the standard polite suggestion formula.