ok so heres the deal, i read kaplans review already but i heard from alot of these threads that it is bs especially in the field of bio. some say cliffs and some say Schaum's. keep in mind that i NEED a 24+ on the dat. so if i get schaums bio is that enough? do i need to get supplemental books for other areas as well? if so, which books in what area? thanks, your $0.02 is appreciated.