Please feel free to email us if you have anything to add. The attitude to take is that there is no problem so ridiculous that you should not know how to do it backwards and forwards. Time yourself doing problems, speed is of the essence. Do expect to feel like this is a big futile waste of your time. No, it is not just your imagination, the exams ARE getting harder as time goes on.
Most people feel pretty horrible while studying for the exam.
Some were known not to smile for weeks on end. Don't be a stranger. Meet with study buddies regularly to make sure you know what's going on and people are worrying about. If you had really flopped the exam, and they thought you should go, they'd call your advisor and say so, and then you'd be having a talk with your advisor instead of taking the exam. In giving you this exam, they are looking for an excuse to keep you, because they want you here and believe that you can do it.