What could you do to make your teacher think you should skip a grade?

i really want to skip a grade. most of my friends will be going in 7th next year while im going in 6th. all the soon-to-be 6th graders are immature and act like kindergarteners and shouldnt be in 6th grade next year. i have never gotten below a b in my life. i really dont wanna go into a grade with immature abusive kids who are super annoying and my mom was thinking about going and letting me take a test but she is not sure about it and i would rather not do that. what could i do to let my teacher know i should go in 7th grade? i tried turing in highschool extra credit work because i know highschool stuff but she is strict and said she would have to give everyone extra credict and so i did the work for nothing. i tried to tell her what i had in there to and she didnt really care. please help!