My first kyu test was nerve raking.
At one point I got a total blackout and thought of stopping, but it passed and passed alright.
My next test was about a year later. It went a great deal better. I was nervous but I worked hard for it and nothing came as a surprise so I built my confidence as I went along.
That was all more than a year ago and I should have graded again. I have many things going on, so my sensei is giving me the time to settle things down.
In any case, I'm not in a hurry to any black belt exam so I really don't mind how much time it takes me to get there. I enjoy training and all that aikido is about and since I hope to do it all my life, there is no reason to hurry along.