Best source for bio

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Cliffs ap bio, what I have been doing is reading a chapter, let's say genetics, then I will watch chads bio videos about genetics then go back and reread genetics in cliffs. Usually by then it will stick. Another way I have been studying is after I read and watch the video about genetics I will go though the destroyer and find all the problems on genetics and see how I do. Also cliffs has quizzes at the end of each chapter. Usually I do real well on the cliff quiz but then get killed on the destroyer questions. I am ALWAYS Stuck between two answers in the destroyer so if youre having a hard time on destroyer well you're not alone. Good luck!
 
Thanks a lot. My only concern is does Cliffs's, KBB, destroyer, Chad's. Do all these cover all the possible bio topics that can appear DAT ?
 
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