Hi!
I would say, as much as I personally love making pretty notes on a well organised Notion page, the best proof of knowledge is understanding! A good retention study technique is to write whatever part of the topic you would like to learn (definitions, case studies, years) on a page and then turn it over and see how much you can write from memory. Add in anything you've missed after you finished in a bright colour, then try again until you feel you solidly know it.
I also found that the easiest way for me to have a good study day was a routine. I would go out with friends too, but going to bed around 10 and waking up early so that I could be at the library bright and early just meant that I felt set up to have a good day. Packing a nice lunch to look forward to and occasionally getting a coffee as a treat was a bonus motivator. I hope everything goes well for you, and don't be afraid to ask your professor or academic advisor for studying techniques too!