Computers & IT (Non-Engg)

do you plan to do an MTech after doing tour BTech in IT? if so, then I must say that this would be a better option. But, if you have a willingness to learn and want to save year as well, MCA after BCA can also get you a good career, depending on your learning of Programming and extra things

You are eligible to seek cyber security or ethical hacking certifications after BCA based purely on your syllabus. You may opt for industry recognised certifications.

It is extremely difficult to get into top 7 colleges through this score if you are an OMS candidate. Some options which you have are Indira, Pune and MIT, Pune. Both these colleges had a cut-off of around 93 percenttile last year.

IEM, Saltlake is the best for BCA because of its placement. Check the placement of IEM's BCA:
http://iem.edu.in/iem-school-of-it/placements/

Cyber Security Awareness in India is constantly increasing and so is its scope.
Ideally, you should study B.Tech / BCS with specialisation in cyber security and then do Masters in the same field.
Click on the link below to see colleges offering courses in this field:
https://www.shiksha.com/it-software/networking-hardware-security/colleges/cyber-security-colleges-india#coachMark

The Linux open source operating system, or Linux OS, is a freely distributable, cross-platform operating system based on Unix that can be installed on PCs, laptops, netbooks, mobile and tablet devices, video game consoles, servers, supercomputers and more.
Basic Features:
1) Portable - Portability means software can works on different types of hardware in same way. Linux kernel and application programs support their installation on any kind of hardware platform.
2) Open Source - Linux source code is freely available and it is community based development project.

I don't know clearly, but I think B.Tech CS give you high salary than MCA.