I agree with the last two posts that am aid would be a great help in this situation. The problem is that there is probably no aid available. I f was in this situation and the teachers original point system was not working for me I would abandon it and try a new system. come up with some other classroom management plan that works for you. the most important thing is that you are in charge of your classroom. Also If you feel like you cannot control the whole class then just start by cracking down on the biggest trouble makers in the class. If you can get these students somewhat under control, others will most likely fall in line. Also if you need help don't be afraid to ask for it. call an administrator in if you need to. This is not your normal classroom and it is perfectly ok if you need some help with it.

Coming in when the students aren't used to you is the problem anyways. My first year of teaching, I came in in the month of November, and it took me almost 3 months for the students to understand that I wasn't going anywhere. They were horrible and acted as if their parents didn't train them to act right. I think you did a great job at trying to use something that they were familiar with, but just coming in and being very stern with them and showing them that you are about business is the key. You may even have to begin sending some to isolation and writing referrals because in their minds, you are simply a substitute and nothing more. You have to show them that you mean business.

Environments like that should include a teacher's aide. I didn't see a specified amount of students, but I can imagine there would be a handful. With a high student to teacher ratio, and you not being their original instructor, ask the administrator if there are any available paraprofessionals to help.

Entering a class that is not yours from day 1 is a very difficult process, especially if the class is already out of control. If you are going to sub there for an extended amount of time, you might have to use your own process as opposed to the one already in place. Try and point out the "ring leaders" and get them on your side. Once they are under control, the rest may follow.

Students often have a hard time getting used to someone new in the room. I would suggest letting the students know you are not going to let up. Find something that would make them think more about their behavior.

It seems there is not a very strong classroom management. These students need a heavy structure that they must follow or the accept the consequences. I would recommend developing a classroom management plan for the students during your time with them.

I agree that you would probably need another teacher or an aide for assistance. With a large amount of students acting out, they are going to walk all over you. You need to remain strict and consistent with punishing AND rewarding students. Make sure to let the students know that you will let the teacher know which students did not behave appropriately so that they will receive further punishments when the teacher returns.