[Reincarnate]

One thing that helps is to find work where you have access to a computer. Try to see if there is any opportunity to work as a technician at your school, or staff a lab, etc. It's less stressful and gives you a chance to get some studying/homework done.

Waking up earlier is also an option, but of course 8am is already pretty darn early. Regardless, if you can wake up at 6:30, for instance, that's enough time right there to work out and then go to class. At least for me, when I was in undergrad, I was able to get a lot more done when I woke up early and went to bed a bit on the early side, compared to waking up as late as possible + going to bed really late. Also helps make studying more efficient.

You say you have class Tues-Thurs, so maybe just work out MWF so you don't have to mess with your class schedule too much.