I agree with most of what you said. For important examinations, I usually take breaks in between or I make sure that I walk or exercise and not sit all day. The brain needs oxygen and stimulus. A good sleep really helps, although sometimes that is difficult to do. My style is simple actually.. After my classes, I study on a daily basis for at least 3 or 4 hours after school. That way, I do not have to cram for my test. 🤔