Koldovstoretz is one of the eleven wizarding schools registered with the International Confederation of Wizards.
This school is mentioned in the Book of Potions videogame, produced by Sony from information provided by J K Rowling. It was also included in a section of "Information from Pottermore" in the new editions (2014-15) of the Harry Potter books. However, it has not yet been added to the collection of Wizarding Schools on the Pottermore website: Collection: Wizarding Schools.
Etymology: The name is a combination of the Russian words колдовствó (koldovstvó) meaning "magic, witchcraft, wizardry" and either творéц (tvoretz) meaning "creator" or дворéц (dvoretz) meaning "alcazar (royal palace)" (dict.com Lingea: Russian-English).
From the Web
Video walkthrough of the Book of Potions game: YouTube: Book of Potions videogame