Okay, here's where you're going wrong. What does a TV have to do with a child at school? Nothing what so ever. That's why it doesn't work.
5 minutes of something taken away means more to someone who has NO CONCEPT of the passing of time than a week of something. That has no meaning to him.
So your consequences have absolutely no effect to him in any way.
The school should be doing his consequences at school. Yes, you should be reinforcing them at home but if he acts up at school and they don't do anything because they are waiting for you to handle it, well, no one is learning anything like this.
A young child like yours needs instant consequences that last for a little while, maybe 5 minutes to half an hour. Otherwise he's already moved on mentally and has no concept of what is happening now as it relates to something that happened half an hour ago.
He isn't an adult, nor is he a teenager who has abstract thinking ability. This little guy is just starting to develop his concrete thinking ability. He will not learn or respond to this type of parenting.
I suggest you rethink how this is going and try to find a school that will deal with this in the classroom.
Such as:
If you put sand in someone's mouth you sit on the bench by the teacher for 5 minutes then cannot play in the sand for the rest of recess.
If you get up and go play with toys during lesson time you have to sit by the teacher....that's a given and I don't know why they didn't do that to begin with but I guess we don't know what all the school has tried. You have to sit by a grown up the entire lesson time. They should have tried getting him an aide of some sort if this is public school. It's their job to keep kids in school and they have resources to make sure the kids are staying in school and have what they need to be able to do that.
If you get an orange thingy for the day you don't get to go to the park as soon as school lets out. You might get a small thing extra at snack time for not getting red.
If you get a red thingy for the day you have to go straight home with nothing extra for snack.
If you get green we go straight to the park for half an hour, something he loves, it might be going to McDonald's to the play ground. Orange days might mean no ice cream cone when you leave or no cookie, that sort of thing.
Kids this age respond to rewards for what the DID DO. Getting orange means he worked at not getting a red, that deserves some notice.
If he gets green it's big fricking deal!!!!
That sort of thing.
**************New topic
Now, that said. Our guy got kicked out of Head Start close to the end of the year. There were extenuating circumstances though. They had been investigated by child welfare for abusing him, the worker has been in my home while investigating my daughter once upon a long time ago. She also testified for us in the court hearing where we took my daughter to court for guardianship for 2 my grand kids. I saw the little card from child welfare that they give to kids who they've visited with during an investigation. They have to notify the parents. SO each child in this classroom had one so the workers nor the parents would know what was being investigated.
I called her right then and asked what happened, I thought we had been reported or something. She laughed and said no. Then she did tell me the whole investigation was because a teacher at Head Start had reported my grandson was being abused during nap time and she had seen questionable treatment at other times too.
The whole school was almost in crisis mode this whole year. Teachers getting hurt and off work, in wrecks and not able to work, the substitutes getting hurt and off work, they were almost at the point of having to close down the 2 3 year old classes just so they could have enough staff to work the 4 year old pre-school classroom. Since it was associated with the public school system they had to keep it running or else those kids would not have received credit for passing the pre-K program.
So he got kicked out because he was "un-controllable". Wouldn't you be acting out if you were being treated badly and unfairly all the time, all day?
So we did not put him there for the 4 year old program, we put him in the public school pre-K program that fall. He got his own aid after the first few months of school, he's on Ritalin and Depakote now and the Kindergarten teacher doesn't even have an aid in the classroom with 25+ 5 year olds.
The point is, we're not perfect by any means. BUT we are working a plan that is appropriate for his cognitive ability, he is not a small adult, he is a little pre-school kids trying to learn how to do stuff and make better choices.
Isn't it better to experience life that has a lot of good stuff instead of a life of punishment and negativity? That's why rewarding him for even the tiniest, smallest thing he accomplishes will have so much more influence in making him work harder to do better.
So all in all, reward him for the right choices he makes.
Let the school dole out the consequences of stuff he does at school. Talk to him about it at home but the consequences will have no effect if done at home at this age.