Since my 2yrs of racing.. I have tried various ways.. what works for me:
1: Getting used to racing with the best in your area at Nationals.
Since just missing on the A Main at my 1st ever national, racing against some of the top 15 guys in the UK. I was a shaking wreck! but has helped me loads.
2: Listen to music before your final is up, and go take some time away from all the noise and relax and listen to your music.
3: Make sure your car is ready-dont leave it last minute..
4: Dont think about winning, drive your own race.. and never have thought.. (Im in the lead) as that always ends badly..
5: Relax your racing a toy car!!!