What really helps me at the moment is to divide each revision slot into 20 minutes each followed by a 5 minute break. This is perfect because 20 minutes is the human concentration span.
Also, buy a small notepad and write a page about each topic, with things like mind maps, bullet points, and anything that makes the whole thing more interesting and exciting to revise. You could colour-code your work.
Think to yourself, "If I revise in the best way I can, I will achieve the grades I want." But what really relieves me is the fact that it will all be over soon...
By the way, just out of curiosity, what options did you take?
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If the phrase "you are what you eat" is correct, technically we must all be cannibals.