CBCA Notable book 2017

In a far flung future Pya, Zumi, Jafet and Trist, live in tiny Cells cared for by tutor-holos, and only communicate through their avatars. Pya narrates how the giant computer ComCen sends them back to 2043 A.D where they meet the twins Rio and Charlie. To survive in an increasingly dangerous world, six quarrelsome youngsters must come together as a team. But can they?