Computers & IT (Non-Engg)

Now, its not possible, there is already a gap of 5 years. A gap of maximum two years can be there but in this case, you need to start afresh.

It can only be possible from the second year and college change or university change after first year is completely dependent on college and university norms. Some universities allow it and some won't plus you need to have good scores in first year to apply for the same. For further details, contact the college authorities.

Follow the link below for details:
https://www.shiksha.com/it-software/networking-hardware-security/colleges/colleges-kolkata

Surely, you can. If you have sound technical knowledge, after 1 year of professional experience companies focus more on your work then your marks in a particular course.

Nirma is undoubtedly a better option in terms of faculty and placements.

Check the link below:
https://www.shiksha.com/university/graphic-era-university-dehradun-22612/reviews?course=36988&sort_by=year of gradution&type=question

Yes you can, these institutes have monthly batches.

Nothing can be termed as perfect, NIIT is decent after 12th but not after graduation. Opt for the course that you love the most and are most passionate about and analyze the future work conditions, scope and growth prospects before taking admission
You can also opt for psychometric test comprising of Aptitude, personality and career interest to clear confusion.

It is an okay college and not a good one, try for some other better college:
https://www.shiksha.com/college/fairfield-institute-of-management-and-technology-kapas-hera-delhi-52681

Pursuing MCA can be good option but industry treats MCA equivalent to B.Tech, so I would recommend you to start working or join as an intern in a good company and pursue MCA through correspondence as three years work experience with correspondence MCA will boost your career.