Hey man. If you have passed all your exams I wouldn't worry to much, flying is the easy part! You have a come along way, finish it.
My advice would be to get yourself a copy of Flight Simulator X and brush up on the following:
General Handling
Circuits
Nav
Radio
You can do all this online thought FSX/Gamespy.
r.e your school, don't worry about what they might think - you'll do yourself damage! Seems to me they should be the ones worrying that you may not return.
I've had no simular experience to you but I hope some positive feedback may help.
Take care and go and finish of your PPL - only 5 hours and a check ride to go!!!!