The questions that I got wrong on the 3rd one - I considered them to be very vague/not clear enough. I did not have any of that on the real DAT. Whatever I knew I knew it 100% - Let me tell you, like I was able to glance at the correct choice even before finishing reading a question. It was that simple. And on the other hand, whatever I found to be obscure I just had no idea. If I knew the name to some very specific things, then yea it would have been like the easiest questions and I'm sure I would have gotten 26 or 30 on this section. I had about 3-4 of those and I'm sure I got all of the ones I guessed wrong. I got a 22.
Topscore 3 bio definitely worried me quite a bit but don't worry. I reviewed them and I just let go it. I spent last 2 weeks reading through Cliffs one more time, redid Destroyer, repeating DATQVAULT (I literally memorized all the questions -_-)..... and on like last 3-4days reading DATQVAULT taxonomy charts, and review all of the practice questions that I got wrong before (At this point reviewing something you already know doesn't really do much, better off just resting your brain).
Good luck, I'm sure you will get at least a 20 on BIO. There will be no tricks. It's either you know it or don't know it

that you don't get too many questions that you have never encountered (looks like everyone gets 2-5 of those generally speaking)
🙂