Nordrhein-Westfalen
If a child is required to attend school, parents will receive a letter from the school administration office in their city or township about ten to eleven months before school starts. They are asked to register their child at a primary school. Registration then takes place directly in the respective school and at the dates fixed by the school administration office. By 15 November of each year, all children must be registered who are required to attend school the following year (https://www.schulministerium.nrw.de/docs/Schulsystem/Schulformen/Grundschule/Anmeldung/index.html). You can find tips and information for parents hier