See my grades I have been waitlisted at both-
English-ICSE NH 96
Mathematics-ICSE NH 100
Social Science-ICSE NH 94
Science-ICSE NH 98
Hindi-ICSE NH 95
Computer Applications-ICSE NH 100
Grade 10-
Social Science ICSE NH 94
English ICSE NH 92
Mathematics ICSE NH 98
Science ICSE NH 94
Computer Applications ICSE NH 98
Hindi NH 92
Grade 11-
Mathematics- ISC NH 98
English- ISC NH 96
Physics-ISC NH 98
Chemistry-ISC NH 95
Computer Science-ISC NH 100
Grade 12 (predicted by school)
English 90
Physics 97
Chemistry 95
Mathematics 98
Computer Science 100
So, I am pretty sure that they are difficult to get in.
But, I realize that the adcom had a perfectly good reason to admit OP, you are great OP do not down yourself. Enjoy the glory of attending your dream school. 