I agree that you should make an appointment now. We suffered through several months of DS being more and more miserable in 2nd grade before we asked for a comprehensive evaluation from the school. We made our request at the end of December, and we didn't have the IEP meeting until mid-March. In our district they don't have to do a comprehensive evaluation unless there's an academic problem, but in our case DS's worsening behavior (and otherwise excellent grades) gave us a good argument.
We were advised to put the request in writing, so the school must respond. I'd try talking to the principal first, though, just to see what she says.
