I think I found a solution! (Pity I didn't get to make full use it before the last exam). Structure. Im terrible without discipline and so I said, one hour after I get up (set a time) I will work for one hour. Then take a one hour break, and work for another hour after that. And so on.

Its worked well. Ive done more revision than I had done the last 2 days. It hasn't been perfect (other issues I presume) and the fact the exam is tomorrow may have made me work more than the structure itself, but I think it did help.

Anyway, thanks for everyone's input and I'll see what happens tomorrow. Ta.