intermediate i can't remember anything!!!!

System

I missed my VAT class for my simulation that i need to sit this Tuesday ihave tried to revise all weekend butit doesn;t seem to be staying in my head can anyone help on a way to remember how to fill in a VAT form and what needs to be added to what to complete boxes!!! Having a nightmare have ECR exam in 3 weeks and we only did Short term decisions on Tuesday Long Term next Tuesday then one week of past papers! my mind is all over the place i don't know how the best way to revise is i have pieces of paper everywhere with ratios on i don;t want to fail but i see no option its just so much to learn and not enough time!!

OK rant over anyone anywhere could offer any advice would be much appreciated!

Thanks

Claire

PS GOOD LUCK to anyone sitting Dec exams x