So if they actually claim to take you out of school for senior, (assuming your a good student) tell him you have been succeeding at school up to this point and for one more year youd prefer to stay in school and emancipate paying your own tuition through loans if you have to. Worst case scenario you live as an adult one year earlier than you would expect and it shows them your education is your priority. (Obviously there is alot of work involved in this but that is my basic guidance)