Yes that's very true. I find that kaplan does a good job in these areas as well (the chems) What's good about the Destroyer is that it has these Roadmaps that are really really helpful in studying the different reactions. For Biology kaplan is very basic. Cliff's or barron's does a good job at covering Biology, and the Destroyer helps to solidify everything studied here. QR is pretty tricky, jusr try to practice as much as possible. Destroyer helps with that too. For PAT I would strongly suggest Crack DAT PAT. You can find a list of the common DAT study materials here http://stu-dentdiaries.blogspot.com. U can just browse the site or hit the DAT study Materials tab.