how to impress my teacher?

Is there a reason for your desire to impress your teacher? I would say, being yourself is number one in impressing anyone. Sometimes that impression is good and others is bad. But by being yourself, you make an impression, because real people are few and far between. This puts on an honesty curve in any relationship, whether personal, social, romantic,professional, or academic. Best wishes!

i impressed my teacher very well. luckly my class at that time students were shouting always.. i started recognise that if iam keep silent techer will give credited to me that iam a good boy.i still foolow my technique and got only sucess

Yes I think to be yourself is good and also to show genuine interest in what they are teaching, ask question and if you can do well with what they have taught you, show them that you are very eager to learn.