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

https://www.oscarbookmarks.win/feeling-nervous-before-a-race-is-normal-but-managing-those-nerves-can-make-all

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