I try to do three sets of four 50-minute hours (study for 50 minutes + 10 minute break). Usually I can read a BR chapter, work through the in-chapter sample problems, and work on EK 1001 problems in one 4 hour chunk (which is really 200 minutes of work when you factor in my 10-minute breaks). Then, in the next four 50-minute hours, I can review the EK 1001 problems, do BR phase 1 problems, and review BR phase 1 problems. In my final four 50-minute hours, I do Kaplan/TPR problems and review those. For me the trick to getting through content review reading is to put a question mark (in pencil) next to anything confusing (for review later). I do not let myself spend a long time on any one page or issue when I read the text. Later in the day, either during one of my breaks or when I am done working, I try to review my question marks in the text, and I look up the issue in one of my school textbooks or in the Q and A forum on SDN. I find that if I don't let myself get stuck on a problem or area of confusion, I can get through the text in a reasonable amount of time (e.g., two and a half 50-minute hours, so around 125 minutes).
TPRH's Sciences workbook does not have many passages so adding TPRH sciences workbook passages just means basically adding 1-3 extra passages to BR phase 2 and phase 3. TPRH sciences workbook standalone questions are harder than EK 1001 standalone questions. I think it's helpful to start with EK 1001 questions and work through those until I don't make mistakes, then I can move onto TPRH science workbook standalone questions until I do not make mistakes. If I am still making mistakes with TPRH science workbook standalone questions, then I think doing additional Kaplan science questions can be helpful (for weak areas).
I personally find using EK, Kaplan, and PR in addition to TBR to be helpful, especially for verbal. I don't mind Kaplan's verbal, which many people criticize for not being representative of real MCAT verbal questions. I feel like the Kaplan verbal questions are meant to teach/force you to think about the passage's organization, structure, style, even if Kaplan's verbal is not representative of the real MCAT. EK and PR verbal passages are helpful because they provide a better sense of what the real MCAT verbal passages will be like. I think BR's verbal is somewhere in between Kaplan's verbal and EK/PR verbal in the sense that about 1/3 of the BR verbal questions seem to be designed to teach you how to approach the passages/questions (similar to Kaplan questions), and the remaining 2/3 of the passages/questions are designed to resemble real MCAT questions (like EK and PR verbal). In short, I like mixing PR, BR, Kaplan, and EK because I think each company has something to offer.
