I'm not sure if this site covering
'Day School' supervision in Cham is of any help to you. It's in German but one of the
translation programmes will help you out a bit so that you get the gist of it.
Otherwise, take a look at this Sticky with lots of links concerning
schools and child care. There might be something helpful there too.
Good luck with the search. It isn't easy here for a single parent/working Mum, but there are others who manage it with several children, so you'll be able to work something out I'm sure.
Good luck.