Study groups seemed to help me the most but if it's solo work that you're struggling with there are a couple of things you can try.
1.
Download some instrumental music, game soundtracks actually work well for this because they aren't really supposed to be noticed, it's all about atmosphere, the portal soundtracks are free if you can't think of any.
Set out your notes and reference books in easy to reach places
choose a comfortable hoodie to wear.
Sit down, wear headphones with instrumental music playing, put up hood and start studying.
2. Works best for memorisation
Grab a tennis ball (or other round object) and toss it against the wall whilst reciting x
Recite x while cooking/cleaning/pacing/walking the dog etc
General rules. Drink water and take lots of breaks. and DO NOT stay up all night. A decent rest before an exam is the best thing you can do for yourself. I've also found that studying in ways that are actually engaging is a huge help like doing all the problems and past exams.
For next semester you should try to set up an area where all you do is study. You aren't allowed to do anything else while in this space. By the next exam period you should have trained your mind to focus on studying when in that space.
Also (as weird as this sounds) try to enjoy it. seriously, have fun. And Good Luck!