Hello Aspirant,

See first of all I would like to tell that the boards ICSE or CBSE , it doesn't really matter if the student really wants to clear the examination of jee he will definitely do it.

It's a myth the CBSE board produces more IITIANS/NITIANS . The curriculum in the icse board is also now following ncert books. So , the preparation should be steady and focus on your coaching teachers whatever they are teaching you