Students get sorted into their pathways around the end of year 9 and come into effect in year 10. The pathways are yellow=top, green=mid, blue=bottom. The yellow pathway is for more academically able students, leading to up to 12 GCSEs. My daughter, who was in the green pathway, ended up with a very poor mix of subjects because of various timetable clashes. She wasn't able to choose a language or an arts subject, for example, because of clashes with compulsory subjects such as RE and citizenship. Not sure if this is still the case.