How does a Canadian child go to study in the U.S?

I am 13 years old, am a Canadian citizen, and my parents are considering to send me to live with my aunt and uncle in the U.S (who are U.S citizens) to study there in high school. They live in Texas, and is there any way i can legally travel to them (live with them) and apply for this public high school?

No. Tourists (which is what you would be) cannot go to public schoool in Us.

Is there any legal way to apply to the school within a few months?

Did you read my answer? No.