I'm entering the game real, real late, and probably doing this will detriment me more than anything. I feel unprepared from TPR, so I got TBR. Takes me roughly 2 hours to do a single section, without the passages... I understand a majority of it from TPR and it's definitely helping clear up some other stuff. I wish I had started this back in January... I'm in the middle of Physics right now, on CH.3, not sure how long it's gonna take me to finish or even if I can finish OChem and GChem between then.