Gnyan Oak CBSE School in Patancheru, for an ICSE boy moving up to class 7?

We've started looking at flats further out past BHEL, because you get more space for the money and a lot of my client visits are in the industrial areas on that side anyway. Nothing decided, we're just widening the search. I keep passing Gnyan Oak CBSE School in Patancheru. Both our boys are in an ICSE school now, the younger in primary and the older heading into class 7 next year. Does anyone know which classes the school runs? And if your child moved from ICSE to CBSE around class 7, there or anywhere else, how hard was the switch?