Hello, everybody. In October, I joined in the first contest in Codeforces. So far, I have played about six games in it.In the period, I am affected by good learning atmosphere in codeforces. In every contest, I can see many drawers and testers. Now, i know that i can't be a drawer for a contest because my level is not enough, but i think i can be a tester for div2 A or div2 B. For me, I really want to experience what it's like to be a tester in a competition. So what do i have to do to be a tester in a competition？If i am not good enough, what level should i reach?