Cryptocurrency is essentially a game only. The new Blockchain is real technology, and blockchain can grow without cryptocurrency, that's for sure. Teaching about cryptocurrency at school does not make sense.
How is it a game ? because there's manipulation ? Without Bitcoin there would be no blockchain.
Cruptocurrency is very complex in nature, understanding its origin, its purpose were really hard to understand even most people in the forum considering it is continually developing.
So, how could you teach them in schools?
Apply in colleges that offers these kind of courses and you'll know how. Nothing is hard if you're willing to learn. It only becomes hard if you don't have any experience with technology which would require more time to understand the basics and get used to before moving in to cryptocurrencies.
https://www.cnbc.com/2018/03/22/colleges-are-now-offering-courses-in-cryptocurrencies-and-blockchain.html