I find the EK material for the sciences to be very condensed, meaning that if it's been awhile since you took a class, the EK books won't be good enough to teach you the material. They are only a refresher. The bio book has good info on a&p systems, and the 1001 questions series is good practice. They are very well written, just realize that you might need to fill in the gaps with other material since some stuff isn't mentioned. For instance, I seem to recall the bio book didn't have info on evolution. Don't remember for sure though. HTH