In Sweden, the students in year 4 took younger children with them and borrowed books from the library which they then read to the little ones.

The children also took the opportunity to build "reading huts" with blankets and pillows which they then sat and had fun in while they read and listened to fairy tales.

This exchange the students talk about and thought it was very fun to see and do something as simple as reading to each other.
It will not only be training in reading for someone, it will also be training in listening for the little ones :)