I am not sure how your child enrolled in the airforce academy which is supposed to be a very good school. Not realizing why your child's dissatisfaction is about the school, it is important to understand the circumstances better to recommend any solution. For your information, there are certainly schools in the U.S. who accept Spring enrollment, but it depends on your child's academic performances and without SSAT and TOEFL, it may compromise the chance of admissions.
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Besant Hill School
The Calverton School
Maur Hill - Mount Academy
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