Bipolar Disorder is also known as "Manic Depressive Disorder". This forum is for questions and support for people with, or for loved ones of people with Bipolar Disorder. The forum covers topics ranging from Aggressive Behavior, Affect on friends and Family,
Alcohol and
Drug Abuse, Appetite Changes, Chronic Pain, Denial,
Depression, Difficulty Concentrating, Euphoria, Guilt, Manic Depression, Medications, Mood Swings, Poor Judgment, and
Sleep Disorders
http://www.ilru.org/html/publications/directory/index.html
to convince his teachers is no big problem because you can show them the script of meds written by the pdocs. The thing even if they are convinced that he has a problem will they agree to let him stay in class?
I would focus more on his health status because he seems to possess some deficit in learning as you said. Parents usually don't agree instinctively for start that their children may have any problem of any kind until they have to face it eventually. Further perhaps the reason he cannot control his anger in class because he feels he can't follow well his teachers which makes him angry . in my view i wouldn't keep resisting their decision provided that it's for his sake and not taken as a punishement.
now for your diagnosis, yes he can have ADHD and still has it along with bipolarity. however it needs a good doc to realise the difference. i.e. i mean whether his restlesness is a secondary to bipolarity (what is called comorbidity in medicine: many symptoms come simultaneously) or it's a compounded illness i.e. BP+ADHD. because i myself was vague for a while about my situation until i was ascrtained that i only have BP and that my reslesness is a secondary.
I also wonder whether your abilify and lamictal were prescribed to you before your new pdoc decided he is BP not ADHD or it's him who changed his med from the ones suited to ADHD to these ones because these are meds for BP. I wish to draw to the fact that one can very well start having ADHD or PD (panic disorder) or OCD then turn clinically bipolar i.e. that the affective disorder was already inside him. So from this side his pdoc can be right. In my view, i agree with him if he has severe mood swings then most probably he is BP no matter what he had in the past.
Finally abilify can make him agitated with insomnia and anxiety, though it's a good AP so i would check on that. usually pdocs write along with akineton to suppress this effect. ask him. Although at his age, i would not give him so many meds and try to concentrate on one med only if possible. lamictal is ok i suppose and good for depression also, you didn't say he suffers from depression frequently.
It's really tricky, in my view psychiatry must come at the end of the flowchart when one exhausts all other possibilities i.e. after checking all other organs, so having disability in hearing or the like would it be responsible of his mood changes, i.e. i wouldn't take pills say to control my diet before i try first to control my eating habits first. try to listen well as to why the teachers made up their mind and on what basis.
sorry i wish i could help more
good luck