i filled out one of my own surveys, just for the qualitiative data to get more ideas that my respondants didn't think of/experience. but i wounldn't recommend doing ALL of the surveys as i think the teacher would be able to recognise the same handwriting, even if you do try and disguise it- unless you did it on the computer and said that you handed them out through facebook or similar...
some people DID do it in my class
, but i haven't gotten back our results to see whether they still got alright marks...