Yes, I would say that is true. I used Barrons to study for my DAT. My scores were:
AA:19
TS:19
Chem: 17
Bio: 17 (Terrible bio section in Barrons)
OChem: 23 (I was already good at it and I corrected multiple mistakes in the Barrons book)
RC: 20 (Didn't study for it)
QR: 17
PAT: 24
Now I'm trying to decide whether I should retake it or not. I think I'm leaning towards retaking it. Is that a good idea? This next time I'm going to use DAT Destroyer and see how that boosts my Bio, Chem, and QR.
Good Luck 😳