Hi again, and thanks so much for your very helpful and detailed reply.
I understand your fear of him starting school soon, due to his behavior problems, the fact that you are not seeing much improvement, but rather, regression to his behavior in Kindergarten with anger issues, and moving will be a change that might cause more issues for him.
I would recommend trying to find a different therapist either for him and/or for you, if the current one you're seeing has not been effective.
I would also recommend that when you want to talk to him about something that happened at school, you don't do it in the car on the way home, but simply ask 'How was school today? What did you do?' and listen to his answer. If he refuses to leave the car after you bring up inappropriate behavior before you get home, you have to fight with him and physically drag him from the car. If you wait until you're in the house, allow him to settle down from the day (of camp or school), let him have a snack and then 'conversationally' ask about the specific incidents that happened with him, involving inappropriate behavior that day, your discussion might be more fruitful and he may be less angry and on the defensive. Don't talk about privileges being taken away at the time, but explain to him that you know he knows his behavior was not acceptable and you will discuss punishments later.
I suggest more testing for learning disabilities, as I mentioned, other than ADHD and perhaps a change in medication. This problem needs to be tackled by a group effort of his pediatrician, therapist, you and your son, all working in tandem to identify the problems and institute modes of behavior modification to overcome them.
If you feel his schoolwork has taken a downturn, a tutor may be a good idea, either through the school/at school, or at home, and perhaps he learns better on a one to one basis. Every child has a way they learn best; some are in larger groups, some are in one to one situations, some understand better, with verbal directions, while others understand better with written directions. His anger issues may stem from frustration at not being taught in the way that's most efficient or comfortable for him, and this is causing him to act out.
Here is a great article on ODD, which is typically associated with ADHD and it includes very helpful suggestions: CLICK
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