Computers & IT (Non-Engg)

I would say a big no. Never go behind the brand name of a college but see the curriculum they have and what they are actually offering to students, the placement and package for the degree you want to pursue there. Don't trust college posters, banners or other marketing materials.
Try to get in touch with the students out their in the institution you are willing to pursue your studies via the social network, or have a visit to the campus and interact with them. All the best.

Computer Applications is a course which is based in and possible in English. You may take explanations in Hindi from teachers or tutors.

That would be difficult to get into. Most of the universities and colleges demand +2 pass with maths as a compulsory subject for The 3 year BCA programme. IPU CET SET are some common university entrance exam. But there are certain colleges which does not require maths as a compulsory subject to join the course. But they prefer a Science or maths student over others.

Age doesn't matter in case of pursing a certification.

Fee for BCA course at Patna Women's college is approx Rs. 13000 per year.

Yes, you can get admission.

You can learn languages from the best institutes like NIIT.