Reddit reviews Colloquial Finnish: The Complete Course for Beginners (Colloquial Series)
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There are admittedly not many good resources out there for learning Finnish. I started with self teaching myself, but never really got very far until taking Finnish classes in college. Self study from things available on the internet isn't that bad once you already have a foundation, but getting that foundation is annoyingly difficult.
It doesn't help that almost every book out there for learning Finnish makes things needlessly complex. At some point or another, I think I've looked at almost every major resource (book-wise anyways) for English speakers learning Finnish. Here's some notes on some that come to mind, feel free to ask about others if you want.
Non-book resources:
Merry Christmas/God Jul/Hyvää Joulua!
This is actually quite common, this phenomenon is known as "Language Attrition":
>Language attrition is the loss of a first or second language or a portion of that language. Speakers who routinely speak more than one language may use their languages in ways slightly different from a single language speaker, or a monolingual. The knowledge of one language may interfere with the correct production or understanding of another.
Which seems to be what you're experiencing with Finnish, especially if your immersed in Swedish culture the majority of the time with school, the media, friends, family (even though you also said the speak finnish) etc.
To combat this I suggest attempting Finnish as if you were a novice...
Books:
Or if it's not too hard you could try something like "Suomen Sujuvaksi" or "Tarkista tästä!" Where Finnish is taught in Finnish, that might or might not help.
Hopefully this helps :)
Also check out Colloquial Finnish. The Colloquial series is really good.
Pimsleur and Michel Thomas are also quite good but they're useless for reading and writing (which are honestly less important, especially for something with writing as simple as Finnish)