In the morning after bathing, close your eyes and face the sun. Then chant the following mantra 6 times in your mind
Om vachalbhuve shree sarvavijayapradhaya namah
Chant the mantra everyday for 21 consecutive days. Then on the day of your competition/contest, take a few grains of rice in your right hand and chant the mantra 36 times. Then take the rice grains in your pocket while going for your competitions. Sprinkle a few grains ,from your pocket, behind you before you start playing/racing. This will help to remove evil eyes and any possible unfortunate events that may occur.