I saw a UK based study a while back which said that 30% of students were in the top 10% of their class at some stage during their school life, but weren't in th

I saw a UK based study a while back which said that 30% of students were in the top 10% of their class at some stage during their school life, but weren't in the top 10% when they finished school. The idea of a fixed pool of "A" students is a false one. That said I think that we should be teaching all students most of the topics he mentioned.