After class is always exhausting but I try to not go back to my apartment until I get a bit of work done (aka I don't let myself go back to my room until some studying or homework is done). That way you can get it finished as fast as possible afterwards and just relax the rest of the day.

Another technique is setting up a time in the evening to start studying. I know I start around 6pm. I eat an early dinner and then work on homework and snack. I think studies have show that you should work for 30mins-1hr intervals. So relax for a bit inbetween and then get back into it (take a shower, bake some cookies, make yourself lunch for the next day). Normally I just hammer out as much as possible (about 2-3hrs) and then take a long break surfing the internet.

Studying is tough :/ Best of luck!