20+ years since I went into teaching and I'm now a cover supervisor for the work-life balance. The school I'm in has a relatively high level of deprivation and lack of aspiration in much of the community. The better parts of catchment tend to brain-drain to other schools in the city. It's a tough gig with a strong "Whay! It's a sub (let's doss)" culture, but what keeps it managable is an engaged SLT and consistent, efficient systems.
Behaviour has shifted in the last 10 years. What was once a "tough" class is now standard (comparing similar schools). We get "double covers" in the hall/ canteen... 55 teenagers in a large space... add in two hard classes close in age, poor work and on-call being unresponsive (short-staffed, dealing with other crises) and frankly you can feel like you deserve a medal for surviving an hour with everyone alive. I've had 18 classes (rather than 10) in the last 2 days, and although they've been relatively smooth, that state of constantly being alert, reading the room and problem solving is draining.
I had a blow-out last month, just all the components stacked wrong. Penultimate week of a long term, lots of illness, immune system fending everything off. I did hold myself until the room was empty and vented. What tipped me was the lack of respect. They had time to tidy the disgusting state of the room and charged through the other door, flattening chairs as they mobbed out. I'd already done a lengthy list of detentions, but the only phone call I could face making was about the single lovely child who did try to tidy up and was least responsible for the carnage. Generally I can carry through remembering the nice kids in each room who deserve my effort and experience.
But most of the time most of our kids are lovely to know, just sods to teach. I feel myself in this school. I don't have to cos-play as a slick suit type as I have in some; I am firm, but human. I can have a laugh but with boundaries. It helps that I'm known in the community and already know some kids. As I get to know them better, it is easing. Getting to middle age and having my own teenagers helps too.
It's a tough job and one that many experienced teachers would quail at, and frankly anyone who judges a cover supervisor for struggling on a bad day can go and supervise 55 12-13 year olds on a wet and windy day themselves... bonus points for every named piece of work handed in at the end...