i have the same problem as you rip,
i think you should create a time table like revise 30-40 mins and reward yourself with a youtube video (no longer than 10 mins) or 10 mins on social media then do another 30 then reward yourself!
Also, keep organised and know what youre going to be revising beforehand. i haven't tried this method that i just made up now but i think its legit. hope it works for both of us! good luck for the mocks were going to die fr