Is it stupid to use two books for Bio? I'm using Kaplan and TPR for Biology content review. I'm using the newest Kaplan book and the most recent TPR book. I like the Kaplan book because I think it "dumbs" down a lot of the content, makes it easy to understand, and doesn't assume that you know a lot of things. I like the TPR book because, in a lot of the topics, it provides a lot of details and has a lot of critical thinking concepts and questions that you need for the MCAT. However, I'm feeling a little burned out because I feel like I am not retaining a lot of the information. I also haven't really started doing practice passages since I just really started studying full-time. Am I setting myself up for failure by using two Bio books?