I am trying to do both. I am working problems and going back to the KAPLAN book when I am a little hazy on the topic. Now mind you, I have already read the KAPLAN book once (twice for the OCHEM AND BIO sections) I think you should work as many problems as possible for the OCHEM and GCHEM, but memorize, memorize, memorize for the BIO. But, I'm prob telling you something you already know 😉 . Good Luck mcataz