The Compex course is not to bad, 5 days usually. Practical and theory test. I dont know of anyone with theory/ exam mock papers, unlike 17th edition of the regs which I have.
You should be fine if you revise daily of an evening. You should get a test bay fitted with components on the course for practical test and they do prepare you properly.
Dont forget They want you to pass or it will look bad on thier pass marks. So you will probably get a nod and a wink with some clues before you do the paper. Just before the exam will be a talk through by the lecturer and this is when you will probably get the pointers. Depends where you are taking the exam. You should be OK . Get your head down and concentrate.... Regards Allan.