Yeh I wouldn't recommend barrons, when I started with it last year, I stopped after a week cause it just had too many annoying errors. I didn't trust it anymore
For PAT, nothing, and I mean NOTHING out there beats crack dat pat. You can start with KBB as a introductory section for PAT, but KBB woun't be enough to hit 19+ on this section. You need crack to get to the 19+ mark