Streaming is the best approach (IMO), as long as the schools are large enough or homogeneous enough (or have appropriate intercollegiate relationships with near

Streaming is the best approach (IMO), as long as the schools are large enough or homogeneous enough (or have appropriate intercollegiate relationships with nearby schools) to make it happen. If you can't make a full class of pupils of whom you expect top grades, then the range of abilities can be a bit too big. You ideally need to be able to promote and demote, which means having at least one subject teacher per stream per year, so that pupils can shift between streams without timetable changes, and having small enough class sizes that the teachers can all cope with a few more being added (as well as possibly doing a bit of extra coaching to get a promoted pupil up to the level of the rest of the class). Selective schooling as a norm can write talented kids off at age 11 if their talents aren't broad enough. Streaming means that children can still excel in their best disciplines even if they are lacking in others.