Interesting how irrate people get about these lists.
The thing is, they are by nature controversial and open to debate. We have no idea on what basis or criteria that list is compiled and if we were to identify our own criteria and apply them, very different rankings might come out.
I think the key is to decide what really matters to you and find a school that delivers it and see it it's a viable option for your child.
Some might look at A Level results in the last year or over the last 5 years or the last 20 or 30 years. Some might do the same for GCSEs. And then there's the question of what you're measuring in their results is it %s getting A or A/A or A-B or A-C.....and can you actually acces that data for the period of time you want in formats which allow you to compare the same thing for each school, to compare it over the period you want to? Probably not.
Some might look at no.s going to Oxbridge or 1, 5 or 100 years, or be interested in those going to RG Unis. Some might be interested in the sporting achievements and what is offered in this area. Some might be interested in the no.s from that school represented in government, law, business or whatever over the last 5,10,50 years. Some might be interested in the staff qualifications over the last 5,10 years. Some might be interested in which has the most applicants per place or requires the highest standard to get in last year, over 5 years. Some might be interested in how long the school has been running or how many famous people went there.
The thing is, you might be interested in any or none of these things. Actually measuring most of them, especially over time and especially in formats which allow you to compare like measures with like measures is next to impossible. So with that borne in mind, any rankings are rather spurious, however expert they claim to be. That is why it's not possible to have categorically correct 'tiers' Of schools and why there will always be disputes about any that are created.
Any ranking system needs to state very clearly what the basis of the ranking is and what data was used to produce it. It is possible to produce league tables for individual years based purely on measurable results, although how accurately that information is submitted and used is questionable in itself. It might be possible to say X school was the top achieving school at A Level in X year, but it's not really possible using measurable criteria to come up with a definitive list or ranking of schools in a general sense. We have to recognise that place in League tables can vary significantly across the years, plus more importantly, what is measured in their tables can only be a very narrow range of information and the things that parents value top schools for in terms of co-curricular and a rounded education and all kinds of other opportunities just can't be measured in those league tables.
As parents, we can look at league tables of academic results. We can draw conclusions about schools in X year from those, and we have to choose based on the other things which are important to us, which vary from family to family, but for most need to include things like location. And in the end we have to recognise that any of these 'figures' expressed don't speak of the impact of the school on individual pupils - some will do better and others worse in all schools. We have to choose what looks best for OUR child who is unique. They can go to the so called best school in the world and if they have a terrible time or have a breakdown or perform significantly worse than they might have been hoped to, all the rankings in the world probably mean nothing for you as a family.
Gather the information which seems important to you and choose a school. Don't be so bothered about a spurious ranking table which is pretty meaningless.