I have been using Physics, Gen Chem, and Orgo BR books and all are awesome (especially phys and gen chem). I was just using the EK bio to start but figured I would hate to be one of those people who is over confident in bio and bombs that section on test day because of it. I went ahead and order the BR bio books just for the passages and even though I have only done a few passages from the first chapter so far, the passages are really awesome. They seem to incorporate things from all of the sciences (ex. pka's of drugs, IUPAC naming of organic compounds) and really make you think. I don't know about TPR bio, or their practice passages, but I am liking these BR bio passages as of now.