I would recommend using slightly different materials for the second attempt, not because the Kaplan books are too old but because you need a new approach. Kaplan is a solid resource for providing a quick broad overview. IMO the lack of practice for CP and BB makes the process of doing content review by reading largely irrelevant because you aren’t set up to immediately review the material. A 505 indicates that you had content gaps that still need to be filled in. For CP and BB, I would recommend TBR for their high quality phased end of chapter exams. The spaced repetition of the subject matter has been really effective for me and my students that have stuck with it. It gives you multiple “at bats” with the material do you can identify errors and fill them in during content review. From there, I would definitely recommend using UWorld under mock MCAT conditions: 2x 95 minute sections to practice timing, strategies, and the pressure of the exam. Get some 3rd party FL exams, any company is fine and each is unique: Kaplan has very specific content details that they test for, NS has excellent experimental passages, Altus has strong BB sections, etc. don’t focus on the scores for 3rd party exams. Just focus on identifying gaps, practicing strategies, and getting used to quickly identifying important info.