Arrgh - Can't Bring Myself to Read!

It's just a slump. I had the EXACT same thing when I did my A levels but luckily mine hit in the last week of my exams at which point I felt there was absolutely nothing else I could do revision wise.

In fact I tell a lie, a had a mini slump half way through my exams. What worked for me was taking a few days away from revision and just doing something else such as exercise, reading novels, playing guitar, watching TV etc.

Eventually I felt so guilty for not revising that I actually revised more until I reached the final near-the-end-of-exams-slump, which you'll also undoubtedly reach :-)

You're quite fortunate in that you've got a few months until your exams start presumably. If I were you I'd take a few days off or a week (maximum) and clear your mind. You'll feel rejuvenated believe me.