What it is like here
The state system is strong and free, but it runs in German and it is not built around foreign minors arriving alone — there is no easy guardian route comparable to Malaysia's. The realistic path is an international school at Western European prices, or the whole family relocating. Good education, bad access.
How the process works
Decide: international school or the state system
The state system is free but assumes German; the international route is the one that works from a standing start.
Establish the family's residence basis
A minor's stay is normally derived from a parent's residence permit rather than granted on its own.