@TJsAunt
It's not ideal with inflated grades but I think you need to look at how they might have arisen, as I don't think it was anything sinister. Lots of leading schools including Winchester College (alma mater of Rishi Sunak) and St Paul's Girls School (consistently the top school in the country) suffered from elevated results during the TAG years.
So, a few reasons possibly for this: (a) leading private schools generally provided a much better provision than state school or smaller indies, (b) TAG was based on a large amount of coursework evidence, including assessments done online/remote. Coursework (or online/remote assessment) is never going to be fool proof as some parents do get involved (not just during Covid years) and presumably professionals were able to work from home during lockdowns and so were around to 'guide' their kids more; and perhaps this is particularly true at the more competitive/academic schools as those listed above and Eltham), (c) private schools tend to use iGCSEs which anyway has a lot more CW content, so more evidence going back a few years as they often run a 3-year GCSE course too.
So, I really think it was hard for teachers but don't believe that schools intentionally manipulated grades but that inflated grades are a result of more CW and remote learning assessment being included in the TAGs.
As for 90% scholarship - that's not even allowed and never heard of anyone getting 90%, never!! I have heard (third-hand) that scholarships can get to 50% (e.g. sports/music + academic) but not even heard of anyone getting 50% off academic only e.g. Most academic scholarships are probably 15-30%, and sports around 10-15%, some possibly to 25%. The school does have bursary schemes and did take on a handful of students from Ukraine who obviously will be on full bursarships. Colfe's, on the other hand, have been known to offer 25% sports scholarships to kids who would not even be assessed at Eltham!
There is definitely an informal sibling policy, in the sense that if a child passes (whatever that means) and has an older sibling at the school they tend to be favoured ahead of external candidates. And why it's a community orientated school. Again, compared with e.g. Colfes, Trinity etc, there are no tests from junior to seniors. Maybe if they did re-introduce that, Eltham would see a hike in grades.
As for Colfes beating them soundly - I think Colfe's reported GCSEs 37.5% 9 compared with Eltham's 37% (not a big difference!). Eltham reported 85% 7/8/9 v Colfe's 84%. So on par, I would say!
At A-level, Eltham reported 44% A* v Colfe's 39.5%. Honestly, very happy for Colfe that they're doing well, it's a great school.