A book I read a long time ago and now wish I'd included as one of my list of 10 ELT books your Mum could get you for Christmas: Teaching Teenagers, by Herbert Puchta and Michael Schratz or "Teaching Teenagers: Model Activity Sequences for Humanistic Language Learning", to give it its full title.
I've personally never been much good teaching teenagers — I've not got the patience for it, apart from anything else. But if you have to, and many of you teaching in private language schools will have to, read this book. It made me look at my teenagers in a different way: teenagers aren't wild animals (no, really!), they're human beings, too.
I can't remember now who first suggested the idea to me, or whether or not it was in this excellent book, but the vital thing about teenagers is not their attitude to learning English (or to you), but your attitude to them. Treat them like wild animals, and that's how they'll behave…
It takes something special to get on with teens; whether you've got that or not, ask your Mum to get you this book — and get yourself some attitude!