I finished all useless pre-reqs so far. Would have started on Science classes first but it takes forever to get a spot for them. I too worry non-stop 24/7 about my GPA. Sigh, just gotta stay focused,...
It is good experience, but make sure you have time left to study so you don't fall behind due to work. CNA is hard work, you'll probably be exhasted when you get home. If you can pay the bills then...