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Thank you for your question. Please permit me to assist you with your concerns.
If I may ask, how exactly is the support order worded at this time? When does it end? Or is the order silent as to those facts?
If he does not go to school, you can file for termination on grounds of emancipation--in essence you can get the courts to involuntarily emancipate him if he is no longer acting as someone who an unemancipated adult and fails to go to school. But you cannot simply stop paying support, you need the courts to evaluate the cause for your filing and side with you if they deem your child's actions as showing independence and self-reliance at this point.
Typically the third option or the fourth option are best. If the child is refusing to take responsibility, then that goes under the fourth option, which is what I believe you were discussing in your initial question.