Take a USMLE class?

[JANPLME]

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I'm a first year and someone has offered to sell me all of their Kaplan Step 1 board simulator books that they never used, as well as some other board review books for a pretty fair price. Should I buy them? Will this be enough to study for step 1 with or will I need to take a class also to do well. Thanks for any advice you can offer.