Probably not especially unless you need extra help with genetics. Bio is memorization - very little strategy to answering questions. There's a method to gchem and ochem in how you approach the problems, and Chad offers an efficient way to refresh how all those things work.
I used cliffs ap, destroyer and BC and I think any question they could ever ask could be found in any of those.. I only used Chad for chem, and I just felt like I had enough resources already but if you really really need practice then maybe you should watch them
@tooth knockn
I like them because he asks the question about the same thing a bunch of times so you get used to the wording.
I just like extra free bio questions as well.