I'm want to study abroad so I'm writing a formal letter to a school abroad. I've visited some schools during me holiday in the UK. I have an Aunt who lives there. The school are in her area.
Here is my version, please help me correct any mistakes and add some sentences :

Dear Sir,

Subject: Application For Further Studies At XXXXXXX

My name is Mohankumaar Maha. I am 15 years old and I come from Malaysia. I would like to inform you that I am very interested in continuing my studies at XXXXXX after my Lower Secondary Assessment Examinations this October.

I ended my primary school with 5 distinctions out of 5 subjects which includes English, Mathematics and Science. At this time, I am studying in Kempas School which is known as Sekolah Menengah Kebangsaan Kempas in Malaysia. I am currently in Form 3 and will be siting for my Lower Secondary Assessment Examinations this October.

I like playing drums and getting involved in sports activities. With respect to music, I have earned 3 drum certificates from Trinity College London.

Recently, I was in the United Kingdom on holiday. I took this opportunity to visit some of the schools in London but I was mesmerized by your school. It was very unique. I hope you would give me an opportunity to study in your amazing school.

I hope to hear from you soon. Thank You

Yours faithfully,
XXXXXXXXXXX
(MOHANKUMAAR MAHA)
Dear Sir/ Madam,

Subject: Application for high school at XXXXXXX for the year 20 _ _ reg.

I am Mohankumaar Maha from Malaysia. I am very much interested in continuing my studies at XXXXXX after my Lower Secondary Assessment Examinations this October (mention year).

I have completed my primary school with 5 distinctions out of 5 subjects which includes English, Mathematics and Science. At present, I am studying in Kempas School which is known as Sekolah Menengah Kebangsaan Kempas in Malaysia. I am currently in Form 3 and will be appearing for my Lower Secondary Assessment Examinations this October. (mention your final percentage of marks).

I like playing drums and getting involved in sports activities. With respect to music, I have earned 3 drum certificates from Trinity College London.

Recently, I had an opportunity to visit your prestigious school. I am very much impressed about the friendly atmosphere and the feedback from the students at your school. It would be a great privilege If i could secure an admission at your esteemed school.

I am looking forward to hearing from you at the earliest of your convienience.

Thank You,

Yours Sincerely,
XXXXXXXXXXX
(MOHANKUMAAR MAHA)
the first thing would be to gather enough information about the school and the subject/courses they offer, then you can now apply thereby being specific.