Listen to French radio (LW), find a documentary, tape it, listen to it again and talk about it in your oral exam. That's if your oral exam is a discussion thing. If it's question and answer, then if it's only intro french, try the following: Learn how to tell someone your name, age, hometown, general personal details, etc. exchange social niceties, hello, how are you, nice weather, please, thank you etc.. Learn some basic shop, cafe, garage stuff, one of these please, 20 euros, cup of coffee, loaf of bread, I have a flat tyre. They will probably ask you about your family, five brothers, three sisters, a cat, my father is a dentist, my mother is a plumber, etc. All the basic phrasebook stuff essentially. DO NOT learn much grammar if you need to cram for a basic french oral. It will all be present tense indicative (don't worry what that means either (-
Find a phrasebook with this stuff in read through the bits you need, visualising the concepts or objects described as you look at the French words.
Now cover up the English side while reading the French side and try to remember each one then reveal it until you've gone all the way through one section. Mark all the ones you get wrong then go through doing the same with those.
Now do the same from English to French.
All along, say the words out loud as you read/guess them.
Have a conversation with yourself, then go through again.
Repeat until tired, then GO TO BED. Have a strong coffee before your exam and have a smell around while you revise that you can have around during your exam: an aftershave you don't usually use, lemon oil on a hanky etc. Smells really help your associative memory, its scientifically proven. Hope this helps. Let me know if you don't have a vocab. list/Phrasebook and I'll try to help.