In the high school, students should wear the same school uniform. Making that would increase the affiliation of the student to his school, change his look to his peers and increase his passion for learning.
Is this an introduction? Sorry, but what you wrote as an introduction does not include any crucial parts of an introduction. The introduction should start with a motivator. Then write the thesis statement and finally mention your opinion, either agree or disagree.
In a conclusion, the uniform is a key factor in the education process that has a vast effect on both the student and the teacher as well.
In the conclusion, you should first restate the thesis statement to remind the reader what issue was discussing in the body, and then write a clincher.
You should also work on vocabulary and grammar.
Hope the comments help