Computers & IT (Non-Engg)

Hello Vikrant,
If you have filled up form stating that you have taken CS, then you have no option and have to appear for this paper also.

Eligibility required for Master of Computer Management Course:
Graduation is the basic qualification requirement for Master of Computer Management course. The qualification must be obtained from a recognized university with minimum 50% marks in the same. Those who are pursuing the final year of graduation are also eligible to apply for the course. Most of the institutions carry out their own entrance exam for the admission process. Candidates with a relevant score in CAT / MAT / XAT / ATMA / CET, etc. are exempted from such admission tests. The marks obtained in the entrance exam acts as the basis for selection into the academic course.

Go through the link below for details :
http://idolgu.in/academic/course/certificate/cca

Master of Architecture Eligibility:
Any Bachelor of Architecture (B.Arch) passed student is eligible for M.Arch Degree course. Candidates appearing for the final exams of B.Arch can also apply.
Those eligible need to acquire a minimum of 50% in the entrance examination.
Some institutes require an aptitude test and an interview for admission into the Master's Degree in architecture.
Some of the Architecture Entrance Examinations:
NATA Aptitude Test
JNTU PACET
School of Planning and Architecture Entrance Exam

Some good books for BCA entrance exam are mentioned below-
BCA Entrance Exam Guide by Rph Editorial BoardBookhive BCA Entrance Examination Guide by S.L. Gulati & Sanjay Kumar SharmaBCA Entrance Examination by E. DharamrajBCA Entrance Examination by Expert CompilationsBCA Entrance Examination ( Popular Master Guide )by R. Gupta's

You need to appear for NEST (National Entrance Screening Test) to get into NISER, follow the official link below for details:
https://www.nestexam.in/
For IISER: https://www.shiksha.com/science/exams/iiser-entrance-exam

Hardware learning will not be of any use to you as finally, you want to get into the networking field. It is better to get into CCNA and enhance your technical skills.

Yes, part-time MCA is available at Bharathiyar University, the fee structure is mentioned below:
Year 1: 15,900 INR
Year 2: 14,870 INR
Year 3: 14,870 INR

Considering you get a good college with good placement opportunities after BCA, you will have a decent opportunity but, with low pay, initially (for 1-year at least).
If you want better salaries and stronger growth, MCA is the way to go after this.
For training period, you get as low as 14-16k a month (6 months) which later goes up to 22-25k. So, its up to you.
Remember a few things:
You need to like coding/programming
Decent in mathematics
Prepare for Aptitudes at least a semester before your campus recruitment starts.