I guess it depends on your Organic professors... I had O-Chem 1 tests that were all free response, lots of rxns and roadmaps. Then O-Chem 2 was all multiple choice, but it could be A, B, and E on 1 question for example. ACS final was a breeze after that, bc it was multiple choice with only 1 right answer. I wouldn't waste money on study guides if you got an A in O-Chem 1 and have done okay in 2 so far...