Most people start kindergarten/1st grade at 4, So by the time you're 11 you're most likely at the end of 7th grade.
As a n*gga that works in a school everyday...5th graders are 10 year olds that turn 11, while 7th graders transitioning into 8th grade are 13 going on 14. Also I know for a fact in my state you have to be at least 5 and have your birthday before a certain point to even start kindergarten. 4 year olds go to preschool my friend. I don't know what kind of Doogie Howser muthafu*kas are starting Kindergarten @4?