Maybe keep in mind that sometimes a little exam nerves can be adaptive - I have read (and WISH I could remember refs) that it just keeps you that little bit on edge and sharper and speeds you up a bit.

I have never gone into an exam complacent, but then I've never really studied hard and consistently (I am a crammer). I always got pretty good marks at uni :> So for me, I think it gave my performance a bit of an advantage.

I guess whatever works for you - but maybe viewing it as something useful might help a little - I dunno ...

Good luck