I always use the 'memory palace' technique for tests, often paired with making an acronym out of a list of points that I've condensed prior (usually by rote). As an example, for my english exams in highschool I would pre-write essays for what I thought the question would be, condense the paragraphs into single topic sentences (through simply writing them a number of times - I could then recall the paragraph from the topic sentence), turn the topic sentences into an acronym and then store all the acronyms in a memory palace (because I had like 10 essays I had to remember).
For actually committing things to long term memory, I have to really thoroughly understand everything I can about the subject, and I think I remember better if I learn a lot more than I have to. To me, the more context I can provide around whatever it is I'm learning, the better I'm able to somehow connect that new knowledge to something I already know.
Edit: you should look up 'mnemonics' if you're interested in other techniques like memory palaces.