Driving licence category C

I doubt whether there is a book, even in French or Dutch, because the situation varies according to which of the three regions you live in and whether or not you wish to drive a vehicle for which a category C licence is required professionally.

This link explains the situation in the Région Wallone and for driving for non-professional reasons https://www.autosecurite.be/wp-content/uploads/2019/04/Doc-134-VF_W.pdf