Hmmm, it sounds like a tough school! Good place to have a week placement but I hope you get somewhere nicer to do your long placements!
Bear in mind you do also get disaffected teachers, and it's totally human of you to judge. But bear in mind this class may be a bottom set in what sounds like a very tough area. There are kids for whom swearing is normal behaviour, and while there is no excuse for throwing things etc, it's likely a bigger problem than anything one teacher can achieve. Faced with a class like this, the only way to maintain order ime is to have very strong senior leadership with a zero tolerance policy on poor behaviour, who are willing to remove disruptive students as soon as it starts. Unfortunately, schools in poverty-stricken areas struggle to attract strong management staff for long. Even a head of department is bound by the culture of the school, so tactical ignoring of things like swearing may be necessary to get students vaguely settled and on side in order to get anything at all done. Another problem with bottom sets is you likely have a real mix of students - some disaffected, some SEN, some students who have for whatever reason missed a lot of school,some ASD, some with horrific home lives, and so on.
Remember this golden rule - your job is to teach the students you get, not to judge them and try to change them.
Do ask what behaviour support management provide, and ask if you can see information about the students in this group, it might be interesting.
Do compliment the teacher on their strategies whether or not you think they work - until you're literally up there in front of them, you can't judge. I know it's really hard not to though! I mentor PGCE and NQT students and still get quite self-conscious when they challenge me on my strategies!