If you take off the “teenager” lens and imagine that you’re witnessing the behavior of an adult who is being denied every variety of personal choice, while being pushed and browbeaten into spending their time in activities that don’t earn them money or status, the behaviors seem almost reasonable.
Just to take one example, if you were forced to wake up at 5:30 AM to get on a bus to sit in chairs for 7 hours listening to mediocre lectures, got in serious trouble if you took more than 5 minutes to move between rooms, had to ask permission to use the rest room, and that’s just what happens before you get home and have a new sequence of orders and chores issued to you ... then you would rebel.