Instruct him to learn system design and UML. Maybe work on a conceptual project. E.g build a complete UML solution for a HN clone for example. That'll take ca

Instruct him to learn system design and UML. Maybe work on a conceptual project. E.g build a complete UML solution for a HN clone for example. That'll take care of the analysis part. If he's enough time then move into discrete maths and algorithms. That'll sandwich the actual coding , after which it'll be a short effort once he's got access to a computer