Our local school did 9 max unless you want to enter extras and self teach. The 9 are Single or Double Science, Single or Double English, Maths, one from French/Spanish/RE/LLW and up to 3 options. My oldest did a couple of extras, triple science, Classical Civilisations and Add Maths so ended up with 12, middlest just did the straight 9 'cause he was sick for most of his GCSEs (ME/CFS). System seems to be changing now for top set so looks like youngest will be doing 11 (triple science and add maths or stats), as well as a few 'weird and wonderful' subjects being offered as after school classes (CC, journalism, latin and greek are being mentioned). EFL kids also do their first language as a GCSE / AS / A2 in yrs 10/11/12 respectively.