Make sure you're revising all the bits when your tutor says "you may need to know this".
Brush up on your Prison Rules and legislation related to certain activities i.e searching, use of force etc.
Learn your definitions of a Catagory A B C D as one of them will probably make an appearance.
Certainly know your call signs, they will definitely come up.
On the "fill in the blanks" the missing words will be proper buzz words i.e it won't be 'the' 'or' 'and' etc.
Unfortunately with fill in the blanks the words have to be exact, however similar your answer is to the correct answer it won't be accepted.
But just relax and enjoy it, it will tell you where you are with your knowledge and doesn't count towards your diploma.