Цитирай Първоначално написано от Manenkoto
Здравейте имам нужда от помощ някой да провери Letter of Application или така нареченото мотивационно писмо. Благодаря предварително на всеки който си направи труда да го прочете и провери.

Dear Sir or Madam,

I am writing in regard to your advertisement in the international magazine named International Adventure Course.
I am 16 years old. My mother tongue is Bulgarian and I come from a small town called Samokov in Bulgaria. I have been learning English for six years in private school. I also study Russian at school. At the moment I am preparing for the FCE exam.
One of the main reasons for applying for this job is that I love working with children. I have experience in looking after such. Last summer I was nanny to three children. I also have a little sister and I often take care of her. She is 10 years old. I would also say that I can organize sport events because I was interested in sports. This spring I am going to apply for a course in first aid qualification.
I am available for startting the job between July 25 and August 30. I can be contacted on 0895723666 after 2 p.m. every day.
Thank you for considering my application. I look forward to hearing from you soon.

Kind Regards,
Ketty
В цитата съм включил поправките си.

Трябва да сложиш пълното име накрая и по-добра логична структура на текста. Да става ясно защо си написала всяко едно изречение, смисълът който предаваш чрез него.