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The fact that one day I will write an essay on this topic for admission, I knew already studying AT high SCHOOL .I always knew that to protect the rights of people is A very interesting and worthy job. So, when I was 14 years old I made A decision that I will be a lawyer, and I HAVEN'T CHANGED my mind SINCE. THAT MAY BE A cause of my wish to become THE president of A school.
So, in 2004 Iwon the school election and became THE president. Protecting the rights of pupils was my responsibility, and I think it was A really GREAT experience for me.

Vsye tak po-duraski neurlyuzhe...Sorry!

The fact that one day i will write an essay on this topic for admission, I
knew already studying in high shcool. Это правильно вроде.. .

I always knew that to protect the rights
of people is very interesting and worthy job. Здесь я бы исправила: I always knew that PROTECTING the rights
of people is very interesting and worthy job.

So, when I was 14 years old i made decision that i
will be a lawyer and i've not chenged my mind. Maybe that is the cause of my wish to become president of school. Здесь так: So, when I was 14 years old i HAVE made decision that i will be a lawyer and i've not chenged my mind.

Maybe that is the cause of my wish to become president of school. Мне кажется: Maybe THIS is...

Последнее вроде правильно...

Я бы переделала вот так:

I knew about the fact, that one day I'll write an essay on this topic for admission, when I studied in high shcool. I always knew, that protecting the rights of people is very interesting and worthy job. So, when I was 14 years old, I made decision that I will be a lawyer and I've not changed my choice. Maybe a cause of my wish was to become a president of school.
So, in 2004 I won the school election and became president. Protecting the rights of pupils was
my responsibility and, I think, it was really big experience for me.