Hello,

If English is not an issue or even if it is an issue, I would recommend you to please choose schooling over any other options.

Ivy League colleges don't judge you only based on your SAT Scores, they also see how proactive and curious you are. What all you can offer as a person. So with schooling you will find many worthy opportunities and activities to prove your mantle. All these will ultimately help in your college application.

So, be it CBSE or ICSE, do CHOOSE schooling.

Talking about personal opinion, I would go for CBSE due to their being a whole lot of people to compete nation wide and number of competition and national level contests to participate into.