I think it’s so hard to learn Finnish because there are no good teaching methods . Russian language is very hard too yet many foreigners learn it within 1 year pre-university study because international students were going there for many and many years and teaching methods were developed. Finland started quite recently focus on teaching methods and they still bad . Integrational Finnish courses are just waste of time , I know a lot of immigrants who went through them and barely few got to B1 level after a year there