I feel like I've hit a brick wall. Basically, I have 3 days left until I go back to school and while I should probably be revising every hour but I'm struggling to to any revision. I'm not lazy...for the first week of my holidays I worked 6/7 hours pretty much everyday and had a good routine. I managed to cover a lot in all my subjects but it's still not enough-I really need to use these 3 days. Before hand, at the start of the holidays, I had this amazing motivation and actually looked forward to revising. Now, at the end of the second week I can't do more than an hour without wanting to die. Nothing is clear, it's taking me so much longer to remember simple facts and I have 0 motivation. Normally if I felt like this I'd take an hour off, but now I can take 5 hours off and still be unable to get back into it. Why is this happening? I desperately want to do some effective revision but nothing I'm doing is sticking and I just feel awful and guilty.