Information Technology

BCA is one of the most popular courses among the students who want to make their career in the IT (information technology) field. Some of the best colleges are-
1. SICSR Pune
2. Christ University, Bangalore
3. AIIT Noida
4. Presidency college Bangalore
5. DAV college Punjab
Admissions to these college are based on entrance, forms are out check their official website for more information. Good luck.

https://www.mmumullana.org/custom/post-graduate-courses-mca
As the link says:
The candidates should have passed Bachelor's Degree of minimum 3-years duration with minimum 50% marks (45% in the case of SC/ ST category) in any discipline with Mathematics/ Statistics as one of the subjects at 10+2 level from any recognized University.
or
BCA Degree of minimum 3 years duration with minimum 50% marks (45% in the case of SC/ ST category) from any recognized University.

https://www.mmumullana.org/
the website has admission form.and other relevant details. You can even search on Shiksha community blogs about the Reviews of the University. You can certainly do this course from there.

Yes, you are eligible for BCA with this percentage.

Visit the below link : https://www.shiksha.com/it-software/colleges/b-sc-colleges-kolkata.

Anil, you can opt any stream but it will be good for you if you opt computer Science as one of the subjects in 11th.

Refer to the link below for the list of colleges:
https://bit.ly/2G9BSX1.

Yes, six sigma green belt certification is worth taking. Its widely accepted certification for quality management, business improvement strategy, business excellence, and process improvement. Utilized in each and ver domain and helps an individual to excel and advance a career. MNCs respect and give value to people who are six sigma certified. You can connect with ISEL GLOBAL for accredited certification which is accepted across 47 countries and is recognised as a mark of quality excellence.

You are eligible for this course if you have taken Science Stream in Higher Secondary education.If Not Computer - Maths then Bio - maths will also make you eligible for taking Computer for this course.

It's not necessary to sit for JEE exam in order to study BCA. There are many universities that have their own entrance exam, or on the merit basis or many other private universities are also there.