Are you sure the 20 days is a real deal breaker at the gifted public school? In our state, the rules are district-by-district as to how to get around the cut-offs, if at all. If you can show by IQ testing at a certain level that your kiddo is qualified, you can get waivers in some districts. I recommend checking with the school again or at the district level. The school already has info on your family since your other child attends.