Am I eligible for BCA? I have scored 89% in 12th.

Yes, you are eligible for BCA. You can easily get admission into top BCA colleges. Just make sure that you satisfy all the eligibility criteria mentioned by them. If you want to learn programming languages which you will be studying in your BCA course then you can check out this app which is special

You are eligible in majority of colleges to seek admission in BCA if you had Maths as a subject in 12th board. You may refer to following link for list of top BCA colleges in India: https://www.shiksha.com/it-software/ranking/top-bca-colleges-in-india/96-2-0-0-0. You may apply in top 10 colleges.A