[jsnk]

I have been out of school for over 10 years, but still to this day, I get college exam related nightmares of all kinds. I can't say what I say will 100% cure your condition, but this is what helped me way back

Can you try to recreate the real test environment and take practice tests that way? Time limit, location, mood, no music or headphones etc. Treat your practice exam as if you are writing a real one and do this over and over again.