Reddit mentions of Complete Finnish Beginner to Intermediate Course: Learn to read, write, speak and understand a new language (Teach Yourself)

Teach Yourself Finnish (note: I don't know if this comes with the audio or it's separate).

Colloquial Finnish. Try and find the book cheap. If you get the latest version. You can get the audio free off of the website.

Assimil Finnish (Le Finnois) This is only available in French, no English.

Assimil Finnish (Finnisch ohne Mühe) Only in German

The only other thing I personally know of is using bittorrent via the usual places, as I've seen language packs for Finnish.

And simply Googling here

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:

1. Teach Yourself's Complete Finnish
   
   
2. Routledge's Colloquial Finnish
   
   
3. Routledge's Essential Grammar: Finnish
   
   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 :)
   

I hope it's okay for a learner who's far from fluent to chime in?

I started with the usual hello, how are you, thank you phrases and learning the word endings. I've mostly used the internet to learn, websites and blogs like Uusi kielemme, and Random Finnish Lesson have been really useful to me, even though they're more of a collection of information rather than methodically laid out like a course. Ymmärrä suomea and Ison Suomen Kieliopin Verkkoversio look really good for the basics and detailed grammar respectively, but they're entirely in Finnish so for a beginner like me not helpful yet. I've used/am using the books Complete Finnish which is like a short course book, as well as one by Fred Karlsson, I think it's called Finnish the essential grammar? And also little phrase book from Berlitz.

What would be really useful, IMO would be a wiki that has lots of exercises, especially one that gradually gets more difficult as you progress. I haven't seen a website quite like that yet and I can't really keep buying more books. Exercises like, IDK, translating songs could be interesting, or having a collection of words that you have remember for you to use in the next exercise.

Kiitos tästä!

That's very cool, I never heard of that! I'll keep it in mind next time I need clarification on something. That other site is cool as well, I'll look into that one a little further as I've been semi-interested in maybe learning Turkish whenever I feel ready to eventually move on.

Jyväskylän yliopisto/University of Jyväskylä has resources for learning Finnish here, it's very comprehensive but also very literal so it's best used as a basic reference point. As in, it's not going to try to explain things to you from a more English-speaking perspective, for the most part. For that a good resource is Finnish for Foreigners, which is a bit old and so it's possible that some smaller details are outdated now, but I liked it because it does a bit more in terms of explaining things for English speakers in a simple way. And it's also good because there is both a textbook and an accompanying workbook. Here is another good one. I also have this workbook, though it's more of an upper beginner/intermediate book and won't do much for you just starting out, and I also feel like it's laid out in a way that is pretty overwhelming. But it's a thing, if you want it. Also, there is this cool site that gives you articles written in Finnish and slow audio readings of them, and what I did initially when I was first beginning is I would actually have one tab with the Finnish open and one with it translated to English, so I could go back and forth and learn words that I didn’t know while I was listening to the audio.

I also have heard good things about iTalki so long as you choose a good teacher, but I haven't used it personally so I can't say much more than that.

https://www.amazon.com/Complete-Finnish-Beginner-Intermediate-Course/dp/1444195220

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This book is a bit expensive, but it's fantastic, would suggest.