Accounting & Commerce

I will suggest that you stay with one industry rather than shifting so frequently. This will not help in your career prospects. Only go for HM in case you are sure. The course can be:
The eligibility depends on the type of course that you wish to pursue, the details of some courses are stated below:
Diploma Class 10th cleared from a recognised board with minimum 40% marks.
Bachelor's Degree: Class 10+2 examination with at least 50% marks.
Post-graduation degree: Bachelor's degree from a recognised university with at least 45% marks.
Graduate and PG programs may also require you to appear in entrance exams such as NCHMCT, AIMA UGAT, E-CHAT, etc.

Manav Rachna (MRIU) is a deemed University under UGC. You can get admission into it if you just have a score card of AIEEE/IIT.
There is no rank criteria as far as I have known. Ranks ranging from 50k to 10 Lakhs are admitted here.
College Fee is quite high and you have other options like GD Goenka and Amity Noida with a little bit variations in their fee structure as compared to MRIU.
You can opt for either hostel or stay in P.G. in the nearby Sectors. You will get all the facilities you will think of like Central Library, Sports Ground, Great Campus, Students from Different Cultute and States etc.
And there are no such restrictions in campus.
Now, the most important part I.e. Placements. MRIU is not so good at Placements with an Average Package of 23 Lakhs. Though most of CS/IT students do get placed but there are very few companies that come for the Mechanical Department and those too are not up to the mark.
So, if youre looking for a good Exposure and Extra Co Curricular Activities, then MRIU is a good option otherwise you can go for AMITY or GD GOENKA which are actually better.
Just keep these things in your mind.
Maintain a CGPA of Above 6 or 60% and clear Back Logs asap.
Submit your assignments on time. They will not only help you get noticed among teachers but also help you in internals.
Enjoy College Life. Dont be just stuck from your Block to Shibiya (Sutta Point).
Participate. Participate in Anything and Everything whether its an event, Sport, Seminar, Interview, Blood Donation etc.
Take Major Project and internship semester seriously. It holds much Importance.

PGDCA is only advisable if you aim for a career in IT industry. Also you should pursue MCA after the PG Diploma in order to enhance career opportunities.
Eligibility requirement:
For seeking admission to the Post Graduate Diploma in Computer Applications course, candidates must have completed their graduation in any discipline with not less than 50% of marks, which is 45% for candidates belonging to SC/ST category.
Admission procedure:
Most of the colleges admit students to the PGDCA course based on the merit secured by the students in the qualifying examination, while some colleges do conduct entrance examination for admission of students to this course.
Job prospects after completion of PGDCA:
After completion of Post Graduate Diploma in Computer Applications from a standard institution, candidates can get job opportunities in the following positions:Software Quality TesterWeb AnalystFaculty/computer teacher at graduation/10+2 level of educationSystem analystNetwork and system administratorDatabase administratorSoftware programmer
Also you may refer-
https://www.shiksha.com/post-graduate-diploma-in-computer-applications-pgdca-article-4601-1