Netherlands, it depends on the level and where you live:

• everyone: Dutch and English, and another language for 2 years
• higher¹ education: French and German, drop one or both after 3 years, keeping the other for another 1 or 2 years
• for kids that are still bored: +Latin, Greek, or Spanish as typical choices (depends what your regional school offers)
• in the province of Frysia, Frysian is mandatory
• in the overseas territories, it can be different again. Not all of them speak Dutch primarily, some don't follow the Dutch education system. I tried looking it up but couldn't easily find how it works in those regions (which may be a "country within the kingdom" or a "special municipality", depending on the island)
• the existence of sign language did not come up, that I recall. So far as I can find, it's only offered on schools specifically for kids that have some level of hearing disability

¹ "higher" is the term that is officially used. I find it a bit derogatory. Having done some of basically every education level, each one has strengths and it's not like everyone from the "highest" one would be able to get a diploma on the "lowest" one. They're just different. Idk what word is commonly understood for this