Getting on a moto program?

Hi I am looking for advise on what kind of training a racer should be doing. Im not super serious about it but trying to improve. I race nearly every weekend and am a fast C rider about to bump up to B. What kind of cardio and exercise should I be doing and how often?
Right now I typically practice one time during the week plus saturday and then race sunday. During the week I will usually do a leg day, upper body day, run a few miles, and mountain bike 1-2 times. I have been trying to get my heart rate down in races because according to my monitor it gets up to 225 at moments( I find hard to believe). What kind of routines do you find have the best results? Thanks