I remember during school I got nervous before every test or quiz or whatever. I guess what helped me was preparing (in your case, just maybe tidy up a little bit and don't stress over it, I know it's easier said than done).

I know for myself, I would always beat myself up after those tests or stressful school things saying, "why was I so anxious for that?" but the key is not to beat myself up for things like that, because the anxiety is real.

I guess the way to confront those feelings for me is to just tell myself self-compassionate things. Like that I am enough even if I fail something.