I was the commissary for nearly two years, usually students not math problems tend to come to me about it. We discuss solutions, I developed a studious habits.
I served as a member of the study nearly two years, students usually do not encounter a mathematical problem, often come to me to discuss together. We discuss answer, I developed a studious habits.
I served as a member of the study in the past two years, the students usually do not have a math problem, often come to me to discuss. We jointly explore solutions, I have developed a good habit of learning.