Hey!!
My advice would be go get all your studying done early and make sure you have a nice long sleep the night before, dont spend it studying all night and truth is...... if you dont know your stuff the night before you never will so get a good nights sleep and you will be able to think better the next day!
Also, i dont know how you learn but i like to write things down and there is a myth that you learn more when you write it down, this is not saying rewrite your whole work again but write dot points so it can jog your memory.
Thirdly and most importantly.............Dont stress!!!!
Goodluck and im sure you will do a great job!