BCA

The eligibility criteria is different for every university. Some universities want the candidate to score more than 70% in their +2 and must be from science/commerce stream with maths and computer science as mandatory subjects. Whereas, some universities requires atleast 45% in +2 and candidate can be from any stream including arts/humanities and also without maths and computer Science as mandatory subjects. So, the criteria differs from university to university.
Therefore, you must check the official website of the university for all the criteria before seeking admission into a university as it'll save your time and effort. 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 specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming

Yes, students from any stream can get admission into BCA in Christ University. You just have to make sure that you have scored atleast 50% in your +2. If you haven't taken admission till now, I'll recommend you to start learning programming languages which will help you during your BCA and you'll have to study less when your course begins. 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 specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming.

That's alright if you are pursuing your BCA from a distance learning center. But you should definitely focus on developing your skills and knowledge. To be hired by companies you'll need to be good in programming or any other area in which you want to work in future. So, start focusing on your goals and gain some experience by attending some certified courses. 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 specially designed and developed for BCA students. It has programs and assignments of languages like C, C+ and Java with their outputs. You'll be studying these languages in your 3 years of BCA.
https://play.google.com/store/apps/details?id=technark.bca_courprogramming

BCA is a 3 year under graduation degree course which is generally pursued by candidates with interest in computers and programming. Whereas B.Tech in CSE/IT is a 4 year Under Graduation Degree Course which is also pursued by candidates with interest in programming and computers. A candidate with B.Tech degree is very likely to get hired by a company as compared to BCA Graduate. B.Tech is much more beneficial as compared to BCA. If you are eligible for admission into B.Tech then you definitely should take admission into B.Tech without giving it a second thought. If you are not eligible for admission into B.Tech then you can go for BCA. BCA is also a good course to pursue if you want to work in IT Sector. After a BCA, you should go for an MCA in order to get a fruitful career.