This Paragraph with English language i need help to correcting it grammatically and in forming the sentence
First of all, let me introduce myself, I am Mohammed Ahmed and I'm working in Egypt as a Dentist. I graduated at Primary school with high Grades and i were the Leader of School morning Broadcasting and the Captain of the Football Team of my Class. In preparatory School I had High Grades especially in the Second year , in which I was ranked third out of 400 students in the biggest school in my City. In secondary school, I did Skills exam to determine the Class that i should be in it.All students from All schools in villages and all schools in my City Applied for this Exam. The Result put me within the Best 30 Student in My City.i graduated at high school with 97.7 %.During my Study, I noticed the Powerful of me in Specific Materials: Mathematic, psychology and Languages Learning and this is noticed from my Grades.