Most people in my school (non selective state school) do 10, a few people with SEN drop the language and do 9. Nobody sits GCSE’s early (unless it is an additional in their first language such as Polish, Arabic etc) so they are all sat in the same year.
Everyone has to do an IT (either comp sci or imedia), a language French/German/Spanish, geography or history and then we have 2 free choices plus all the usual compulsories.
It goes up to 11 if you are selected to sit triple science instead of double (teachers make this decision not us). Some people also take further maths and/or another language after school but there are not many of us. So a handful in my year do 12/13/14.
I do 12 (triple science, eng lit & lang, maths, fm, comp sci, geography, history, French & Photography) and it feels like a lot but I love maths & science so I suck it up.
From what I can tell, a lot of independent schools (not all) sit 8/9 which enables more study time per subject (and better grades), which I’d love as 12 feels quite thinly spread across the timetable.
As I understand it the uni’s that do look at GCSE’s only look at your top 8/9 anyway and most don’t bother other that to check maths n English grades, so more is not necessarily better.
Hoping that doing more than the average amount will help me cope with the workload jump to A levels (only y10 atm) as I already have to organise myself pretty well to make sure I have time for sports, friends, sleep etc as well as the absolute mountains of h/w my school love to give.