Anyone who has taken SAT Biology please help

So I’ve been prepping most extensively with Barron’s. I’ve read it cover-to-cover and have memorized almost everything in it. However, since I heard Princeton Review has great tests, I took theirs after I took Barrons’; on the first PR test I got a 750 but on the second I got a 670 (yikes) due to me not knowing stuff from PR specifically. Do I need to know all the random things in PR or is Barron’s by itself good enough??

Barron’s is fine. Those tests are not exactly like the College Board official tests and they do ask for a few more random memorization questions. That’s why they are usually thought harder. The actual test has more critical thinking questions and the way the questions are phrased it helps you to answer correctly if you truly understand the concepts and know the most important facts.