My mother tongue is Finnish, I am fluent in English and Swedish and relatively fluent (can read literature, speaking "tourist level") German and French. Those languages I had at school.
I studied Ancient Near East, meaning Arabic, and a bunch of dead Semitic languages (Sumerian,Akkadian, Biblical Hebrew, Aramaic), some Latin and Classic Greek. Never learned Arabic so well I could actually use it, unfortunately (it is beautiful and rich language).I can read it, but slowly (Hebrew script goes a bit better and I took also some courses in Modern Hebrew
Then odds and ends on the way: Italian, Spanish and Portuguese on the tourist level, can read Cyrillic script but don't know Russian besides a few words (I worked making spellers for some Turcic languages -- written in Cyrillic!). Basic courses in umpteen languages, sadly mostly forgotten...
(and then I'm making fantasy languages, just as there were not enough of real ones in the world...
)