The league table system is frought with problems, and provides no useful information.
For a start, it has nothing to do with education, it's about appealing to parents, the ludicrous notion o 'parent power' which itself means nothing at all.
Parents are treated by successive governments as the consumers of education - that is because parents vote. Give them the (utterly false) notion that they have some impact on their children's education, and you could snare their votes. Yes, it is that cynical.
So you have a 'league table' - and your school is top. Great, nice for you, you did nothing to make that happen, but you may vote for the party who told you that they did.
Your school is bottom? Tough. There is nothing you can do - you can't move your child because the 'top' school is oversubscribed, so you can't get near it.
That illustrates the futility of comparison, and the simple fact that the comparison is utterly meaningless.
Would you compare the Allies in Afghanistan with ISIS? They are both fighting in the same place, doing the same thing, but there are one or two important differences that make the notion of comparison facile.
It's the same with schools. A 'bad' school may be doing wonders in a deprived area with limited resources and a dedicated staff. A 'good' school may be coasting with bright pupils and a four-figure PTA budget.
What on earth is the point in comparing?
It's not supermarkets - you can't opt to do your big shop down the road until your local supermarket comes back into line with prices.
The best thing as a parent (and I am one) is to make sure your kids are happy, fulfilling their potential, enjoying school, and keep the hell out of things you don't understand.
Yes you went to school - we all did, which is why governments pretend that we all know something about it. Nonsense! I wear glasses - it doesn't make me an optician!
Ignore governments' cynical manipulation of parents' absolute desire to do their best for their kids, and know that you have no power, so love your kids, raise them right, and everything will be OK.