Haha, ok did not realize you were so young. Congrats on getting involved with fitness at such a young age. It is a great hobby to come by! However, you obviously are not going to be able to eat how many prescibe in here while in grade school. I believe you should have multiple small meals per day in school, but unfortunately, the government thinks education is the only important thing. Who cares about health, as long as they are smart that is all they need. LOL, touchy subject, but I recommend simply eating as good as can be. Eat a hearty breakfast before school, make healthy decisions while at school, and eat 2-4 meals once home from school.
You don't have too much to worry about at your age. Just make healthy choices and stay active. Do you play sports?