Last year I was a student teacher. In NZ we rate how "high" and "low" schools are on a decile system. A Decile 10 school is "tops" while Decile 1a is the very bottom.
I taught in a variety of shcools on my placements. In order the decile ranking went 3 --> 8 ---> 1a ---> 6
So in both semesters I jumped from a low to a high school.
I expected that the students at "high" schools to be better behaved, do their homework, be smarter etc etc. But when it got down to it, I liked the lower decile schools the best. The kdis were great to work with, they worked harder, they respected you more and you really felt like you were teaching. At the higher schools I found the students harder to manage, they were more apt to back chat and "snobby". I like the lower schools.
In terms of expectations, it was interesting that at the medium school the students had really low expectations fo themselves - this came from the teaching staff mainly. I went in with high expectatoins (just like in everyother school) and the students wouldn't even think of rising to meet them. However, i think most of that had to do with the school culture.
However, that is not to say that it wil be the same for you. People in my course who also went to the schools I went to didn't have the same experience as I did. I think it comes down to knowing what sort of people you get along with and trying to find a place where you fit - which is easier said than done of course :-)