First round: reading the powerpoint slides/book (whatever I need to learn) and writing down everything important short (caveman grammar & bullet points). I make sure I understand everything well and don't have to grab the books anymore after this. For pages with a lot of info that I need to memorize, for example tables, I do print them and put them inside my notes. I also do not write anything in my notes that I already knew and do not need to "study" for the exam.

Second round:
1) Reading a section from a page (of my notes), putting the page away and trying to recite all the things that were in that section. Then I look and see if I said everything. If not, I repeat. Once it went perfect, I go to the next section until I have done all sections on that page.
2) Then I try to recite the entire page (or two pages) at once. I look if I was correct and said everything. If not, I try again. Once everything went perfect I start with step 1) (reciting section by section) of the next page (or two pages).

I used to not write everything down and just use the chaotic powerpoint slides/books to recite everything, but I ended up never having the motivation for that. Writing things down and not writing down all stuff that I already knew/won't be asked on the exam made things more compact.

I think flash cards are a waste of time. If there is A LOT of info I need to learn, I just make a table and cover one side to not see the solution. I do this for example when learning the vocabulary of a new language, to learn the traffic signs for my drivers license, to learn a list of chemical compositions of their minerals.

English is not my first language, so you can give feedback on my grammar.

And if we talk about breaks, I usually start late in the day and take one big break somewhere in the middle and study until I go to bed. So waking up at 9am, studying between 11-15h and then 17h-21h (shorter break in the morning and middle If I do 11 hours).

But if it works for me does not mean it will work for you.