Does anybody have advice for test anxiety

I feel super confident when I do the homework and participate in Ace,
but I feel like when I get the quiz all the knowlege and confidence goes away and I make simple mistakes.
Even if I see a problem I worked on an hour ago and see it on the quiz it feels like I'm seeing it for the first time.

If anyone has any test taking/ study techniques they would like to share I would greatly appreciate it.
Thank you.