Is the Barron's ACT practice test accurate??

I take my ACT in 2 days and decided to take one more practice test to see where I was at. I decided to take one from my prep book (Barron’s Act Prep).

I have taken four or five other practice ACTs through my school and I have figured out the difficulty of the normally and I have to say that the Barron test was harder than the previous ones I took. I scored significantly worse on it which kind of scares me because I don’t have much time to fix that.

My scores from the last ACT practice I took: English: 30, Math: 28, Reading: 29, Science: 28
My scores from the Barron’s test: English: 25, Math: 22, Reading: 29, Science: 20 (???)

I am not sure if it’s because I took the Barron at the library instead of school and the test wasn’t that much harder and I just got more dumb. I will say that for the math section of the Barron’s it was a lot more “complex” than what is on the tests I have taken previously…

Not what I was hoping for before my ACT. Anxiety is at 110% now.