It’s funny you mention that because just 6 months ago at the academy I wrote on my end of course eval that the academy should be offering techniques to students on how to maintain nerves. I went through the same thing, past students and even instructors telling me that maintaining my nerves was the key to passing the evals, but no one gave me advice on how to do that, so I had to figure it out on my own. This article helped me a lot:
How to Stay Calm Under Pressure When Things Are Falling Apart
Basically, everyone has different techniques that help them more than others. For me it was all about staying positive, I told myself that I was going to pass, stayed away from any negative thoughts, and kept myself busy(sudoku, crosswords, games) while waiting in the classroom for my turn to take the eval. Also as mentioned above, knowledge is power, the more phraseology and rules you know the more confident you’ll be going in.