There's a few places to go to see official rankings for this, but another way to look at it could be to examine the end results and decide that way. What I mean is, take Germany for example. They may not rank high officially, but think about most products they make there. German made anything is usually of the highest quality and for decades they've been world leaders in various development and engineering areas. United States and England have the best universities. I guess answering this would be determined by if you need official or opinionated answers.
This is a tough question, because I've checked a few different resources, and they all say something different. For example, Swotti.com claims it's Finland, then Belize, then Singapore, but Rankopedia.com claims it's Japan, then UK, then Australia.
According to the "PISA" Programme for International Student Assessment, Shanghai, South Korea, Finland and Hong Kong were top in the last couple of years. http://funadvice.com/r/14uqa7ncriv
It is definitely not the UK. I am in the UK. And am thick of all the simpletons here. The education system has let a lot of children down here.
It is in some ways. But it is in a mess at the minute. Balance is way off.
The uk seems like a cool place though