yes i HIGHLY recommend it even though i didnt take DAT yet you see the results of learning bio from his guide on the practice tests
I also used campbell's bio book (HIGHLY recommended for understanding concepts) for anatomy and physiology since i never took any college courses on that and also learned all info from feralis's notes that werent in the campbell chapters
if you want to do well on bio learn the whole thing through his notes. almost every word on that guide is important