Study for 20 minutes and take a 5 minute break.

This tip is especially useful if you're finding your study difficult. If it's going well and you're in a good flow and you're remembering what you are learning, you don't need to take a break.
However, if it's hard and beginning to feel like a chore you should take a five minute break, every 20 minutes.
During your break, always leave your study area. You could have some brain food, drink some water, go to the bathroom.
During a break from studying, ensure you stretch, like before exercising, as this allows more oxygen into your lungs and therefore more blood and oxygen to your brain - enhancing learning.

Revise your most important information last

Your brain remembers the last thing that occurs or most recent times. Which part of a movie do you usually remember? Which part of a novel? Usually the ending. Both the first and lasts are important for your memory.
Here are some interesting statistics. If you read a traditional accelerating learning book it will tell you, quite correctly, that there is a period of time you can be learning for, in a lecture type situation, and then your brain will get full and information recall will get harder. This happens approximately every fifty minutes. These books suggest to study or learn for 50 minutes and then take a 10 minute break.
However, if you do this, you study for 50 minutes and take a 10 minute break, in an hour time frame how many firsts and lasts do you have? Two. One at the beginning of the session and another at the end. There are two opportunities for what you are studying to be very, very memorable.
If you just study a little bit smarter, and studied for twenty minutes, then took a five minute break, three times over a one hour period, how many firsts and lasts have you got now? Six. That means that six times over an hour, it's easier to remember your information.