Do you think this is a good idea?

So I want to go to this certain school but to get in you need a certain grade for 3 certain subjects. 6 for math , physics and science. I have a 6 for math, 7 for science but for physics I got an 5.9 . I was thinking I could go talk to the headmaster of the school and see if he can let me in even though my grade is 0.1 less than what It's supposed to be. Do you think this is a good idea ? If yes, what do you think I should tell him ? (I heard he's nice too)