Undergraduate / Every year on vacation, I tutor 2 or 3 students - this is one of my extracurricular activity [3]

I think you do an adequate job answering the question. You elaborate your reasons as to why you choose to tutor. Grammatically, however, I feel like some things could be changed. Some of the words are awkwardly phrased,

"Every year in during my vacation" , "I feel I learn so much a lot when I teach someone"; "it made me determined not to give up helping the student who had passion to learn."--could be better phrased

"So I love tutoring." could be changed to "And that's why I love tutoring."

Good luck with your application! :)

Undergraduate / My dream of becoming a corporate lawyer. Columbia - Why this major personal statement? [4]

I feel you did a good job at answering the question, and gave a clear reason as to why you picked your field. The only thing I can suggest is maybe switching up the order of the paragraphs, or adding in transition sentences if the word limit allows. Right now, it feels just a tad bit choppy. But that's just being nit-picky; other than that, I think it's a good essay.