What are the ways to impress a teacher?

Behave in class, do your work, participate in class, be helpful.

let me add on to that answer ^ anyway, yes, u should do those things. but lets be clear- when ur trying to be helpful or a teachers pet by going shhh! real loud and saying ur teachers name over again in a sweet voice, and asking too many repetitive q's (i like to call those questions the lame q's) its gonna make yaa teacher give the impression of- pesky, little annoying, but smart

also, try to be modest- i mean seriously, theres this person (not naming) i know that attends my skool is not modest- the persons pretty smart tho....but from the looks of it, my teacher finds "the person" decent but pesky and talkative. so try your best to not try to hard. believe me, ive gone there before. oh yaa, try to do ur work NEATLY. trust me, teachers just crave over neat work. and behaving in class, not much explaining. helpful tip- what i do is, i think of the peskiest person i know and i think, before i do it, what would that person do? i come up with what they would do and do the opposite, and sometimes its the other way around. its pretty good tip;) although not best answer, i hope your satisfied by this:D