You might wanna do a visit to the school and watch him with his daily routines.

The kid has a lot going on right now, and I am sure you have that in the front of your mind.

New school. New home. New surroundings. New kids. A lot of NEW things. This can be stressful for anyone, but more so for someone who has a hard time communicating it, and even worse for someone who is not really verbal.

I would also make a plea to the teacher to be more patient and understanding.

Being difficult is not a reason to send a child home (unless it's daycare! and even then, if they accept a special needs child, they should be equipped to handle one.) Unless he is a danger to himself or others, the teacher needs to learn to deal with your son appropriately. Have they already started the IEP? I'd contact the school therapist (psychologist) and find a way to make it work. If you know his physical cues, you may need to relay them to the teacher so she can watch for them and do something to redirect him before he becomes too much to handle.

You're probably going to see some regression and some aggressive behavior as he learns to adjust to a new life. But, you don't want a bad experience to ruin his desire to continue to go to school.

Is he verbal so that you might be able to ask him if he's upset with the new school, teacher, moving, etc? I know when Anniah had a major change she worsened. Her behavior became super aggressive. We were able to pin point why, but for your son it doesn't sound so easy. There could be another student setting him off, or sadly, the teacher. If he can communicate, it would be good to ask him. Not about why he's being aggressive, but about how he feels about his new home, school, teacher, etc. Hope this helps!

Is he in a special ed class? Kind of funny, to me (not in the haha sense) I was raised in Las Vegas, NV. I suppose it may be partially because I have been living in smaller towns since moving from there, but I do recall growing up in the school system, they had many special ed classes per school, as well as an entire school specifically dedicated to special education needs/students. Whereas, everywhere I have lived since then, there is really no such thing. Here they do have a special school for autistic children, but I believe it's probably over an hour away from where I live.

All that said, what I guess I am getting at here is, is it possible to have him moved to another classroom? It's a pure fact of life... some students, special needs or not, do not get along with some teachers. You could have an amazing teacher (like my son's kindergarten teacher) who just flat out is NOT a great fit for the child. My son hated school in kindergarten. And I really felt I would end up home schooling him. All I heard was, "He's a disruption, nothing he says is relevant, he doesn't listen before blurting out things that have nothing to do with the topic." I felt my son just... wasn't gonna make it. Enter 1st grade and the TEACHER made the difference. Instead of brushing him and everything he said off, she took the time to LISTEN and realized he is more relevant to the topic than anyone else is. And now he LOVES school. 2nd grade worries me... the teacher will make or break my child!

Do you work? If not, and you don't have younger children at home to care for, you may want to consider homeschooling him. Or find out if there are other schools in the district who are a better fit for your son. If you live in Vegas, they will bus your child to one of the 1000 other schools there if they have a better program for your sons needs. At least they did when my family was growing up there. My youngest sister, for example, needed speech therapy badly. But the school she was attending did not have the resources so they sent her to another school 3 miles further from the one she was zoned for. In high school, I needed special services that my zoned school were not equipped for and they sent me to another one about 7 miles away. I have Asperger's myself but was in mainstream classes, however, they needed counseling that my school did not have.

What does "being bad" mean? There is a lot to adjust to for him. When my children "misbehave" I do what I can to get into their heads and walk in their shoes. ASD usually don't communicate needs very well, so a ton of misbehavior could be about needs not being met or misunderstanding of expectations. ASDs need a lot more structure usually and can be irritated when in new environments with little predictability or structure.

The environment itself could play a role. Is it really noisy? Is he/she expected to participate where that was not true before.

Do your best to observe and put yourself in your childs place. I'm not suggesting there is no such thing as "bad behavior", but I am suggesting that a lot of behavior issues I have seen end up being something else. Mostly due to inability to understand social norms, difficulty communicating needs, or discomfort

My husband and I talked and what if you could teach him that if he's starting to get upset my something he could start tapping a pencil on a desk or table or by clicking a pen so that you and the teacher would know he's upset and y'all could distract him and get him away from whatever is upsetting him. Such as drawing a picture to calm him. Did y'all move during the summer or was it during the school year? It may have been the upset to his normal routine that set him off. Possibly getting him back into a similar routine might help to calm him down. See if he likes yoga too. Its very calming yet helps with focus because its intensive