My exam is Today and have not studied?

Ok my Business exam is on last period. I was suppose to say up BUT fell asleep.. We are allowed to bring in summary notes of the chapter in the exam to help us... Still i would like to study the notes Im writing. My exam is on last period which is around 2pm...Its 7am now and I'm thinking of going late to school (I'll say Im sick) and go at 11-12pm... I am really nervous.. I don't the chapter Very well?... I just need some advice...It is still possible to get an ok Mark?.. (PS i know i should be doing it on but i just want some advice first I really nervous) :(