The Level Check is a one-to-one conversation that is done to establish your level. The first conversation immediately after registration is a Level Check.
The assignment of the level is essential in order to be able to book subsequent conversations. In fact, only conversations of your level will be allowed for you to book.
It is possible to change your level by booking a new Level Check. These conversations can be booked by accessing the BOOK menu and locating the LEVEL CHECK submenu.