Kinderpedia allows managers and teachers to be added to multiple school or kindergarten accounts using the same email address.
In order to easily switch between different school accounts, all you need to do is hover with the mouse over your name on the top right corner. You will see that a menu shows up with some options for your account alongside a list with the school accounts in which you are added. In order to switch to a different school account, simply click on the name of the account you wish to switch to. The first school name listed under your name is the school account that is currently selected.