Racing nerves can mess with your focus, but simple breathing really helps. Try...

https://www.jelly-bookmarks.win/feeling-nervous-before-a-race-is-normal-but-learning-to-focus-can-make-all-the

Racing nerves can mess with your focus, but simple breathing really helps. Try breathing in for a steady count of four, then slowly out for six to eight. It calms your mind and slows the heart rate