PLEASE help me prepare for the PSB exam! (ADVICE)

I'm in my late 20's and not happy with my career choice.. the pay is great, but it limits me to living in one area where I have no family. Nursing will enable me to move anywhere and find a job relatively easier. I have 2 children, but I'm embarking on the journey!! I always wanted to be a nurse, so .. why not?

I have 6 months to prepare for the PSB exam. I've ordered McGraw-Hill's Nursing School Entrance Exams, ARCO Master the Nursing School and Allied Health, & ARCO Nursing School And Allied Health Entrance Examination books. I am pretty much starting from scratch.. I need help in the Math & Science sections of the test. I'll be honest, I pretty much am starting from scratch in those areas. Can anyone recommend what books will help teach me what I need to learn? I've put thousands into taking all the classes to get me the best chance of getting into the nursing program, not to mention time away from my family.. I only get one shot at the test & I want to succeed. Any advice would be greatly appreciated!