I'm screwed. I recently got sick, but i have a PSAT test tomorrow?

What can i do to help myself focus and what should i do tonight? i have an excessive runny nose. like snot seriously just drools down. and i cough a lot. and my head hurts, feels like it's huge. and i have my psat test tomorrow. what can i do tonight to make myself feel better? also the nights are pretty hot these days, should i still dress warmly? i hate being sick -_-