Self-introduction(the Graduate Record Examination retest,please help me,thank you!)

Good morning, dear teachers. I am very glad to be here for this interview. My name is Li yang Liu, 22 years old. I come from Rao He, a very beautiful county of Heilongjiang Province. In the year of 2009, I entered Hai Nan University, majoring in Applied Chemistry. During my time there, I studied hard and I was always active in various activities.
In the everyday life, I like thinking about different subjects, which will not only allow me to gain more knowledge, but also make me more mature. In my spare time, I like playing basketball, table tennis, working on the computers and reading books. When I do something, I can focus on it, and forget other things, which really makes me happy.
Taking part in the Graduate Record Examination is a turning point in my life. I consider this process to be quite valuable. I have solidified my professional basis, enhanced my standard of English, understand the current state of our country and the relevant national policies. I know that there are still a lot of knowledge that I need to learn. Please give me an opportunity for postgraduate work opportunities.Thank you!

[Your English is quite good.  The corrections were mainly subtle differences in expression.  Good luck.]