Return the BOOKS! Take that money and by the best prep books out there.
TBR is great for the sciences (a little too detailed (more than you need to know)), but what makes them a great book is the end of the chapter passages. Great practice.
Examkrackers are the best for science content studying. They get to the point of what you need to know, without going too detailed.
TPR is good too if you must, but I recommend the other two before them.
For VERBAL practice, you must must must get Examkrackers 101 verbal. And if you can find one (usually get overcharged for it) is the TPRHyperlearning Verbal workbook.
Both books have several passages for practice!
Many people on this forum would say the same thing to you.