When the body and mind disagree

I hate feeling this way. It's like my mind is saying I need to be studying but my body and heart is telling me to heck care.

5 more chapters to revise before tmr's quiz. My mind is in a whirl now. What debit this account and credit this account and then there's the ten thousand million rules not forgetting formulae. I cant even think straight. I need to get on with my revision.