I can only remember one or two people in my veeeery long teaching career that might have not benefited from being at a GS - that's a very small percentage.
Personally I always use 'qualify' for a GS as the raw score is different every year.
Gosh! That implies a number of rather sad conclusions, amongst which:-
1. The standard of education offered to the vast majority of our children is therefore sub par as only a very small percentage attend the 'super selective' GS.
2. Education should be offered in a uniform way without regard for a childs individuality or skillset, be that academic, artistic or sporting etc etc.
3. That specialist schools offer an inferior education even when that education is targeted to specifically assist children with specific needs or talents.
4. That the comprehensive system of education has failed.
5. That academic success is to be prized above all other success for all children.
I concur that the Raw scores vary year on year. As I understand it the process of standardisation, which is mysterious for sure, is therefore employed so that the pass mark remains consistent year on year.