FIND YOUR SLEEP RHYTHM
Starting each day of the exam preparation period sufficiently rested is very important for your concentration. Therefore, try to find a rhythm in your days and nights. It doesn't really matter at what time of the day you start or end your studies. What does matter is that you get up and go to sleep around the same time every day.
If you have trouble falling asleep due to exam stress, do something other than studying before you settle down. Make a list of what you are going to do the next day, that's one less worry.
LISTEN TO YOUR BODY
Not everyone benefits from a day rhythm that, for example, starts at 8 am and ends at 9 pm. There are indeed morning and evening people. So find your most productive moments and use those hours optimally.
Are you really not tired in the evening? Then there's no point in crawling into your bed early. Conversely, if you are very sleepy, go to sleep anyway. You can't concentrate any more. It's better to start to learn in a fresh and cheerful mood the next morning.
DREAMING FOR YOUR MEMORY
Do you need an excuse to take a nap during the day? Then it's handy to know that dreams can even help you study better. Research at Harvard University proves that by dreaming you train your memory.
You have to get into your REM sleep, the fifth sleep phase. In that phase - after the fall asleep and deep sleep stages - your brain really goes to work. Your creativity and problem-solving abilities are now stimulated.
Admittedly, an afternoon nap of fifteen minutes can give you some relaxation, but unfortunately it won't really help you to learn this course by heart... Half an hour's sleep, on the other hand, could have a positive effect.
Good luck!