I am retired at this point, but I remember having a very difficult math group of 7th graders. The regular teacher was on sabbatical, the sub had a nervous breakdown after a quarter, and the principal asked me to switch my lab class with the math class to give the sub a break because "I was able to handle such kids" according to her. That put me under much pressure.
I had read something about food rewards and stashed it in my library. This is what I had to do with the 12 unruly students:
I handed out 10 play money dollar bills to each student. They were laying under their desk or on the floor because "they could learn better that way".
1st expectation was: they had to pick up the money from me, could then look into the big basket of treats at my desk, and had to sit on a chair to participate.
At first we started with 2 participants and I had to teach the lesson best I could. At the end of the first class I had not asked for any money back and let the 2 participants choose a treat on their way out.
Next day 3 more students asked to participate. I catered to those 5 students during our math lesson and disregarded the folks on the floor. I asked the 5 what actions would be fair to call for pay-back money to me. The 5 students suggested: not sitting at one's desk, talking out, not turning in homework. We agreed, ignoring the inappropriate comments from the students on the floor. I added a reward of a paper dollar for "productive participation".
We continued that way on Wed. and Thur. No more new participants in my game. At the end of Math on Thursday I announced that the 5 students could buy and eat treats on Friday with their remaining money from my classroom store (which I set up that night in one of my cuboards). When the inappropriate comments started towards the munching, I announced that any "non-participating and quiet student " could purchase a treat of my choice at the end of our class time. That cooled some down and at the end I was able to give 2 more students a treat. That concluded just one week.
To make a long tedious story short, it took 3 weeks to be able to teach to a group of students, sitting in their chairs and participating to some degree. We decided as a class after 3 weeks to have popcorn and a video on a Friday if all students had at least 3 dollars left by Thursday. There were 2 students who had blown their money and we voted to send those 2 to the library while we had the popcorn & video. The Principal picked those 2 up and escorted them to the library. (I had principal support throughout my experimental money sceme).
After 4 weeks we had a regular lesson, homework turned in, moneys going out and coming back to me, some Fridays just a video and other Frid. popcorn & video. The kids said a movie was not a movie if you didn't have popcorn with it. We often could only see 1/2 of the video one Friday and the 2nd half the following week.
I was able to give appropriate grades to the class at the end of the quarter. Food rewards, kind but firm attitude from the teacher, and support from the principal, turned out to work for these Middle Schoolers. It was hard work, but you might want to apply food rewards. It's worth it!
Ursel