He may be taking it because he doesn't feel safe given the kidnapping experience. I'd suggest reducing all extracurricular activities until he's getting a C or better in every class. Supervise him doing his homeworl on the proviso that improved grades will yield reduced supervision. The kid needs to learn how to concentrate on his work and that means parental involvement by both of you. You also need to get involved with all his teachers to make sure they understand the program and are being supportive.
Teachers love getting calls like that from parents of kids with bad grades.
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