I'm working full time while studying as well, and for what it's worth, I've felt the same way before and just had to keep trucking through it. I skipped ahead to the NA section, absolutely bombed the shit out of almost every curriculum question, and wanted to just completely give up. I just kept spamming those questions during drills after work bc I had nothing better to do (going 1 or 2 for five on mid-level difficulty) and paid close attention to the explanations - over the course of about a week and a half I was able to take max difficulty 5-question drills and go 5/5 every time within time constraints. Literally the switch that flipped was just having more confidence. If you go in thinking you've hit your ceiling or that you "know your limitations," it becomes a self-fulfilling prophecy and you will in fact hit a ceiling, but only bc you set it there yourself. If you accept that you can learn from every mistake you make and that practice makes perfect, you will make progress. Just keep at, spam the shit out of drills, ESPECIALLY the max difficulty ones, bc even if you never make perfect 5/5 drills, it'll still make all the easier questions seem like a cake walk on test day. You got this.

me too, I'm super upset lol today is my day off work and I was planning on a full study day