I'm an MFL European-trained teacher working part-time in an academy where there are some behavioural issues. I've been working hard to adapt myself to the British system. The last two observations I had have been "good". Unfortunately I've been given a Year 9 French group that wasn't enthusiastic to start with and now their behaviour is worse. One pupil told me he hates the lesson and that I'm a very bad teacher. They also hate my seating plan and refuse to sit where I tell them.
What you said
Year 9 are renowned for being a challenging group. Try speaking to their form tutor for strategies; talking to individuals; speaking to their previous teacher; brushing up on the behaviour policy, contacting parents and getting some behaviour agreements in place; and speaking to the head of department about where to go with the class. You shouldn't be tackling this alone.
Don't let them see that they get to you by saying things such as they prefer their previous teacher. This probably isn't true and they just want to annoy you. Be very matter-of-fact: "Yes, I'm sure you did prefer Miss X, but you have me now so just get out your planner ..." or "Well that's a shame, but everyone has lessons they like less than others." Don't take things personally. Show them you don't care what they think, just that they make progress.
The expert view
Never fear, this sounds exactly like what every teacher goes through. You have a new group and children are often frighteningly resistant to change. And they're Year 9, a group that appears hard-wired to refuse your simplest instruction. The problem isn't you, it's them, and how they respond to new adults.
All the wriggling, the chafing, the obstruction and faffing - this is perfectly normal, unpleasant behaviour in the context of your situation. How do you handle it? Set your stall out: tell them exactly what you want in terms of behaviour. Don't bother negotiating the rules. Just tell them what you need from them in order to run an ordered room. Definitely have a seating plan and if they object then to hell with them! Summon other staff to assist you in getting them in their seats. This isn't playtime and they have to sit where they learn best, not according to their friendship groupings.
Anyone who mucks around or ignores instructions, give them a detention. If they reoffend, muck around in detentions or fail to show, then repeat the process, but this time get line managers involved, escalate the sanctions and call parents. Then repeat, repeat, repeat. It will exhaust you. But it's an investment in your own future.
Tom Bennett is author of The Behaviour Guru and Not Quite a Teacher. Read more from Tom on his TES blog, or follow him on Twitter at @tesBehaviour. His latest book, Teacher, is out now, published by Continuum
Post your questions at www.tes.co.ukbehaviour.