Your son sounds just like mine- he single handedly won the class the pajama party for reading minutes- he reads reads and reads- rushes through the work when he does it ( he does not apply himself) and would do everything you described-he is impulsive, talks a lot- except when reading. we call him the loophole king- "well technically you said x not y." it's exhausting. We tried montessori when he was younger and it was a disaster- they do not do a good job( from my experience) of really letting them go at their pace and they can get away with doing as little as possible. One Montessori preschool said- he keeps asking for more activities- he's done all the ones that are out already- I said give him new ones- they responded with but it's so fast that should be in an older classroom....I am sure you can fill in the rest- so we moved him to a different school. Structure is better for mine even if he bridges that getting in trouble line like yours- the Montessori was not good for us- FWIW. smile
Good Luck!
Brandy