Just to be dull...
Sit with the Flight Manual and re-learn EVERY single limit. Play hangar pilot and rehearse every emergency that can possibly happen to you.
If you're in the position to, use up an hour doing all the stuff an Examiner will do with you (Apart from engine-offs!)
I suspect if you become fully confident in your own abilities, you'll be OK.
I wish I was diligent enough to do all of the above, all the time!