cliffs is a much easier read. i got a 22 in bio on the canadian DAT's..didnt touch schaums. what helped was kaplan (obviously), cliffs AP and relying on my memory from past bio courses i took in university (also did topscore and achiever and the subject tests). i tried reading schaums a week ago but couldnt concentrate because all i kept thinking about was how i had to study organic and QR a lot more!