It has been about 7 years from when i last took my general sciences and dont remember much. If i study from dr. collins would that be enough? If I need to reteach myself the material what sources should i use? I am currently using the purple book from Kaplan Pcat science. The kaplan biology i am finding overwhelming. The chemistry is ok so far. I plan to take the exam in july. If i study too soon for the bio i may forget. If the dr. collins material is sufficient to know then i wont waste time on kaplan. Please Advise!