I have visited Rockwell some 2 weeks back. Personally i found infrastructure decent, classroom, library, canteen etc are quite good. relatively small ground. They have a strength of ~600 to 700 students. For pre primary they follow an integrated curriculum and for higher sections its Cambridge. Fee all inclusive will be in range of 2.4 Lacs.
Best to avoid Rockwell. Teachers are not trained, curriculum is very fragmented, curricular activities are also not great. Principal has changed recently. Not much to look forward.
There are many other options if you want to spend so much money.