So I've been enchanted by the mantra heard on SDN that TBR is a golden MCAT resource. I got through the chapter on translational motion, did a few untimed passages, and became distraught when, for one particular passage that has five questions, I only got one right! Now, I spent a lot of time with the answers and the explanations and I feel like I learned a lot from my errors. But I still have to ask: When do you reap the benefits of going through these brutally hard passages? Do the benefits come as you do more passages within TBR? Or, when you start doing AAMC passages from the official practice exams?