If you are trying for an admission in this school from class 1 and above, just give up. We had visited the school for my daughters admission in class 5 and were told to register on their site, which we did and followed up frequently with the principal & admission staff in this regards.
To our surprise we see a list of 9 students who are given admissions and who had registered after us. We don't even get a call. The school management says they are all under sibling quota. Nine kids under sibling quota?
Shows the admission in this school probably happens through references and recommendations. Nine admissions in the same class under sibling quota is difficult to accept.
I recommend you don't waste time in trying for admissions in this school and instead try in Oakridge, DPS, Rockwell, Pheonix Greens, Gaudium etc where the response is more professional and chances are you may get an admission based on the sequence of enquiry and assessment and not based on references and recommendations.