When working problems, work several problems before consulting the answer book. If you look up each answer as you do the problem you cannot help catching a glimpse of the answer to the next problem. The result is that you are not really working the next problem. Prepare a set of flash cards to help you remember reactions. Design these cards to help you remember reactions in both the forward and backward sense.
Organic chemistry is a very cumulative subject.
These cards will be invaluable for reviewing. Using flash cards prepared by another student will give you some benefits but much of the benefit of the flash cards comes from you having to think about the reaction enough to prepare the card. Solve the more challenging problems at the ends of the chapters. The answers to most of these problems will not be obvious to you when you first read the question. Do not give up too quickly.