Endocrine by Fischer (Kaplan videos) was amazing ! it helped clear a lot of concepts for me. Otherwise, Cardio and Respi by Kudrath is also good in kaplan. A lot of good physio concepts are covered in PASS videos...really amazing explanations with path and pharm connection. I suggest Cardio and GI especially for PASS (biochem too). Otherwise following BRS physio with FA is good. Thats what I think! at the end application is what matters, so even though u know the concept, a lot qs are twisted and asks you with those up and down arrows...so i guess use U-world or other qbank for practice.