Chad's Videos for Biology

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Hi guys, I am wondering if it is worth it to use his videos for the biology section. If not, should I just skip it and use that time instead to focus on say, AP Cliff's bio?

I'd be interested in hearing feedback in this as well, chad didn't even offer videos on bio when I was studying for the dat.

In your case, the one thing I'd keep in mind is that cliffs and Barron's are tried and true, so it's a safe method to go with if you continue to be wary of chad.