Finland's an amazing country, but beware of the educational timelag effect; the kids who produced those very good PISA results in the early 2000s were basically going to school in the 1990s--a generation ago.
Since the start of the century, Finland has been moving more and more in the direction of Sweden (holistic, interdiciplinary, kids running around doing forest school, getting rid of desks in rows etc.). That's nice for the kids, no doubt, but the kids who have done more and more of this have done progressively less well in their tests.
Also, while Finland did well in PISA (which is mostly about reading comprehension), it was always an unremarkable performer in TIMSS, which is more curriculum-based and focuses on STEM. Finland's strong performance in reading, by the way, is exclusively the result of Finnish girls being really good at reading. Finnish boys' reading skills are very average and only a little bit better than those of UK or American boys, despite the fact that they have a much, much easier writing system to contend with and should therefore be doing a lot better without even trying. Finland's gender gap (between girls and boys) is the largest in the OECD.
www.brookings.edu/research/girls-boys-and-reading/
I am not trying to pour cold water over poor old Finland, which has perfectly decent schools and is a wonderful society in general. But the press has really over-hyped the Finland phenomenom, while failing to understand that there are some basic structural reasons why Finnish kids do quite well...
Basically, they live in a society which loves reading, they have one of the most transparent writing systems in the world (most kids pick up reading from sharing picture books with parents and looking at the subtitles on TV---no wonder the Finns can get away with not really worrying about early reading instruction very much), and then there is Finnish history. Finland was a very poor, downtrodden country until relatively recently in its history; when it eventually achieved independent nationhood, there was a massive push for literacy, education and learning (including the creation of a brand-new, super-logical-and-easy-to-learn writing system), rather like the kind of historical trajectory we saw in some of the East Asian countries of Japan, Taiwan, South Korea and Singapore in the mid 20th century. Countries which develop rapidly and late, feeling a tremendous sense of "We have to catch up with all the rich countries," tend to have a terrific zest for teaching and learning, at least for a while.
Predictably, Scotland and Wales have been trying to copy appealing-looking bits of Finnish schools, without properly understanding the wider context or the reason why these things might work in Finland. If you delay the teaching of reading for years in English speaking countries, it'll have a negative effect on the kids' outcomes, because it takes such a long time to become properly fluent in reading and writing English, and it's too complex to let the kids just "pick up" from reading the TV autocue and signs and food labels. That's just an example.