Revision sucks!

This is for all the other GCSE revising teenagers out there. I am currently writing a blogpost in a break between my Biology and English Lit revision. I am currently working from 9am to 6pm in 30 minute slots and I HATE IT. As much work as I am doing I just don't seem to be able to understand anything. It does not seem to be going into my head. Its annoying as well because if I don't get the grades I am expected to achieve it will be 'You obviously didn't try hard enough' when that is not true.

Anyone else struggling?