I enjoyed teaching teenagers - they have lots of "spark" and creativity and can be very funny. I think it is a shame though that so much is "teaching to the test" and not allowing either teachers or pupils more freedom in between so many rounds of examinations these days.
I spent 4 years in the 6th form system though, the first year training in two comprehensives, and then 3 years as a teacher at a sixth form college.
I have delivered G.C.S.E. resit courses. I've also delivered the AE (advanced extension) & STEP paper awards (the tricky ones some universities demand) - those problems are really hard but it was a great experience to have to understand them deeply enough to explain them.
With maths and electronics concepts found that teaching really made you think. And was discovering new ideas in stuff i had just "Taken for granted" during my own studies or raced through while doing exams earlier in life. That's one reason i did it too: Realised after first degree didn't really understand much. So went back to the start and for sure it did me good, helped to keep feet on the ground, and had a lot of good classroom dynamics and good results aswell.
Future ideas:
(1) I'm interested some day in looking into special styles such as music + other subjects for students in various groups: maybe towards autism spectrum, ADHD, behavioural issues, or self-esteem problems, aswell as general concentration, focus, and creativity tricks, in the time of so much social media and pressure to conform.
(2) Have chatted to teacher friends inc. London inner city about all sorts of things to do with modern schooling.
I believe kids should have the chance to be kids and not put through as much testing. And that teachers should have more support from central educational resources departments to help with lesson deliveries because responding "all at once" to modern world internet etc while juggling all the other teaching demands it's a lot to ask ; and also more freedom to vary their approaches (some time set aside for that maybe). So, might pick up some projects some day to do with that.