letter to th eschool principal for admission to grade 8 -high school

Please could you assist with this letter to a school for admission to the school. My son is an average student so we need to take attention away from that . see my letter below .

Dear Sir,

The purpose of this letter is to request that you consider our son, {Name}, for enrolment to your school. Please allow us to tell you about him. We have also attached his past year's results and certificates awarded to him for your review.
{Name } is studying at [School name] Primary school and he is currently in grade 7.
Besides his academic activities, he also has an active and healthy social life. He enjoys cycling, rugby, baseball, cross country running, swimming and computer games.

Please kindly consider our son as a potential student in your school . As you can see his time to shine is still ahead we want to give ABC every opportunity in life to succeed and reach his full potential. We are confident that by attending your school, he will become better prepared to face life's challenges and to achieve his dreams.
We kindly request you to consider our request to admit him in to your renowned school.

Thank you very much for your kind attention and we look forward to hearing from you.

Yours Sincerely.
Mr. & Mrs.