Computers & IT (Non-Engg)

It will be very effective as Cambridge English exams matter a lot but I would recommend UGC NET and SET exams because they help you get job in colleges or universities.

It is totally dependent on you. Both are very good courses with very good scope. But try to choose the field in which you love to work and you have very much interest in it with curiosity, it will be very much beneficial to you than any other fields. Don't follow the craze, scope and popularity, it keeps on changing, but the field of your interest.
Best of Luck and Work.

Yes it's a good option.
But don't go for MBA just because you are not good in Maths, Maths is in both MCA & MBA.
Go for MCA if interested in Programming/IT field.
Or MBA if interested in Management.
Make sure you do MCA from good college / university.
If you choose MCA then side by side of MCA do some certifications when you will be in 2nd or 3rd year as it will help you in getting good package.
Maths is hard I know but keep learning, give your best and someday you will love this subject.
Good luck.

India is one of the largest industries for information technology. I would say there are lots of opportunities in India after finishing your BCA.
Some of the IT roles you can start with-
Technical/Desktop Support Engineer
System / Network Engineer
Software Engineer/ Developer (WebApp/ Mobile)
Level 1 (HelpDesk) Engineer
Only BCA is not a good option to progress in career.
For a successful career you need to do Masters after BCA.
You can also do other short courses like software testing, web development, etc.
Just BCA or MCA are not enough unless you have extra skills.

https://www.shiksha.com/it-software/colleges/mca-colleges-india
Please click on the above link to get a list of good MCA colleges in India. Also, try using Shiksha online college comparison tool to get all details and differences between colleges and easily get the best college for yourself.

They all stream are related to each other and also study about the computer programming but their are little difference like B.Sc computer science is little easy than BCA, BCA is advance than B.Sc, and B.Sc IT is study about coding and hacking and program work.

IT industry is in slow decline phase because of outcry against outsourcing in Western countries and increasing restrictions on working visas, therefore, days ahead for IT professionals will be tough. But it still a good option for bright professionals. The shelf life of IT Technologies is 18 months. If you are ready to continuously re-skill yourself, you will never face any challenges in IT industry.