Do you have access to a school psychologist? If so, talk to him
or her about it and show him
or her the
test you were just talking about. If not, see if you can see the school nurse. Reach out to a professional at school.
I remember when I was about 12, I started having concentration problems, along with a few other issues, including feeling sad, isolating myself. Lots of headaches too.
I had some issues when I was a senior in high school.