My son started prep ( we are in vic) on monday and we are in the same boat with the cut off, as someone else said the cut of is april 30 and my sons bday is april 22. I sent him to school. lots of other people said that I shouldnt, the difference is he is ready to go and is loving it.
Again like others said is this compulsary? it in the end is up to you? do what you feel is right for your child. I would wait a few more days, talk to the teacher and see what they say. goodluck