Asperger's Syndrome & medication

I'm asking this question for my son, who's currently in foster care and at a "youth ranch" because at 11-years-old he was not responding to direction from his parents and sexually molesting his sister, who's a year younger. He's currently 13 (will be 14 in February), and just had a home visit for four days over Christmas--his first home visit for 9 months, although we've been to visit him regularly every 2 or 3 weeks while he's away. I was very concerned to discover that he's now on 6 different medications, incuding one for schizophrenia (Abilify), although to my knowledge he's never had that diagnosis--the consensus among everyone who'd dealt with him for the past two years is that he has Asperger's Syndrome. It's a very long story, but my immediate concern is that his medications are inappropriate and possibly conflicting--he's on two different antidepressants. If I could afford the medical sevices that he needs I'd have custody restored immediately, but I'm not in a position to do that (another long story), so I'm just trying to do the best I can to make sure that "the system" isn't just subduing him with medications until he's old enough for them to cut him loose--he's a very intelligent, warm-hearted kid, and deserves every opportunity to succeed. The following is a list of his medications and dosages:
Abilify 5mg am/pm
Effexor XR 75mg am
Tenex 1mg am/lunch/dinner
Celex 40mg 1/2 am/1/2 dinner
Adderall XR 10mg am
Depakote ER 250mg 750 mg at bedtime
I guess I just really need a professional opinion as to whether it's okay for him to be on all these medications at the same time, and if it's going to be a matter of keeping him on these med's for the rest of his life, since I've read that discontinuing some of them can cause severe reactions. I really appreciate any help you can give me in this matter....
Thanks you,
Nancy Knight