My oldest son took this for a few weeks last year, when he was 14. He suddenly became very, very chatty on it. We were used to car rides or dinners out in relative quiet with him...he wasn't withdrawn or anything, but never dominated a conversation. On Adderall, he couldn't stop chattering. It was like a truth serum LOL - I got his unfiltered opinions on everyone and everything, gossip from school, no subject was off limits (really, I didn't need to know which girls were know for giving a BJ to anyone who asked - NOT a subject we normally would have broached). He was louder and a bit obnoxious.
After a few weeks, he started intentionally "forgetting" to take his tablet and by the time school ended, said he hated it and refused to take it anymore. Coming off of it was rather unpleasant. He was kind of an abrasive, irritable, angry jerk for a week or two and then got back to his normal self. Tapering wasn't really an option because he was still on the lowest dose.
School-wise was a mixed bag...the spring semesters were actually the worst of the year academically, but that's typical for him anyway and I think in a way he was sabotaging his grades to bolster his argument for not using medication. In any case...there weren't any awful side effects for him, but he just didn't like it, didn't think it helped him, and it didn't make a huge, noticeable difference in his school performance or level of distracaibility or general inability to attend to the details of daily living.
It was worth a try for him but just not the right medication. Good luck with your son and I hope you get good results but if not, keep an open mind, keep track of his reactions, and be willing to try something else if this doesn't work. I found that a daily journal helped me to track his behavior while trying medications. Also, if you have high deductible insurance where you pay the full cost of prescriptions early in the year before your deductible is met, have your doc prescribe only a 10 day supply of any new med. If you haven't yet picked up the prescription you can have it changed now. That way if it doesn't work out, you're not throwing a way a month's worth of pills that you paid for, I learned that lesson after his Concerta trial didn't work well (headaches) and I was stuck with over $200 worth of pills. I gave them to a friend whose son was on the same medication so the pills weren't wasted (that's not exactly legal, btw) but the money certainly was.