I love to go to school, love studying, love to meet and do so many activities with friends
I love going to school, studying, and going out with friends.
you should maintain the same tense throughout the sentence.
I believe all the time school is one of places that I can do my best
I always believe that school is one of the places where I can do my best.
I always got excellent grade, my student profile is very good and I was school's representative
I always got excellent grades. my student profile is very good; which made me represent my school...
I always challenge myself in many competitions, I never missed
this is not clear
When I studied grade9, I went to admission new high school
when I was in ninth grade, I moved to a new high school.
Overall you have a lot of grammar mistakes. You should let your English teacher review your essay before you send it.
I advise you to revise this essay a bit more