GFPT is all about SAFETY. You don't have to be Chuck Yeager, but you have to be able to lookout, put the plane on the ground in one piece, GO AROUND where necessary!
Basically everything you have covered in your training to date can be tested in the GFPT, but some parts are optional, which ones are done will depend on your testing officer.
If you are unsure about something, ASK! e.g. he says "Show me a stall" then you could ask "do you want be to recover at the buzzer or after the stall?"
Try and relax, make sure you know your aircraft, privileges of GFPT and the Air Law you've been taught today as well. If you need more specific advice, then ask your instructor, or even another student you know who's recently done the GFPT about what they did in the test.
Good luck!
