Hi sdot!
dungtd255 has pointed out some of the correct grammar mistakes (some were NOT mistakes, like "start school" is a perfectly fine phrase).
I think you have done a very good job for this essay despite those mistakes. The three ideas are very valid and well-supported. I also love the way you introduce the essay and conclude it. You have succeeded in making the essay personal and not too dry, which is a very neccessary thing. The ideas are presented in a logical way. However, you can give personal examples for the 3rd and 4th paragraphs to make them more persuasive.
As a whole, I would rate the essay a 5.0+/6.0.
Keep up the good work!
Phuong