I was under the impression that French was on friday so I left this to the last minute. I too, sat chemistry this morning and now I'm learning my French writing.
My advice is - since like myself, French is one of your strongest subjects study the writing only.
I got 30/30 for the speaking part of the exam, 20/20 for the writing in the prelim, 27/30 for the reading (oops) and 17/20 for the listening (not my strongest point).
Anyway- In the reading exam you have a dictionary so you can look up any unfamiliar words. Listening is hard, and only effective way to study listening is immersing yourself in a French speaking country. You can get 20/20 if you learn your writing accurately.
So my advice for the exam is:
Memorise your writing
Forget about listening
Use your dictionary to define any unfamilar words for reading
Relax!
Good luck!
I agree with the previous respondent - split your writing up into paragraphs (I have eight), say them and write them down first with looking and then without looking. If you're stuck, have a peek but have a punishment (ie one pushup).