Before my third graders began kindergarten, I spoke to the Principal to ask that she assign the teacher to my twins to match the more difficult twin's issues as the other twin would be fine anywhere. The principal did pick the best match. Subsequent to Kindergarten, we did not have any choice unless I formally requested removal from the pre-grifted/gifted class. However, we were given a survey of the sort that you mentioned every year during the first week of school. I generally asnwer as succinctly as possible but do include information that may be relevant for that child.