Any course offered by an institute like IIM Calcutta is guaranteed to be of the highest quality and have significant industry relevance. Instead of this course, it is recommended that you take the CAT and then enroll in the flagship PGDM program at IIM Calcutta. That would be entirely consistent with your desire to work in investment banking. 

The recent financial crisis was largely caused by managers' inability to fully comprehend and manage the operational risks of the new generation of derivatives. Future finance managers, it is believed, must be fully equipped with the mathematical and conceptual theories, as well as best practices, that go into the creation and management of such innovative products.
The IIMC faculty combines academic excellence with top management industry experience. IIMC also hires international faculty from top business schools. The IIMC certification and alumni network help participants advance in their careers. The program is only for working professionals, and there will be no campus placement after this course. 

I am assuming that by dual MBA you are referring to the PGP program offered at ISB Hyderabad that allows you to specialize in 2 majors. You can either choose one concentration area and one industry course or both concentration areas.

This program is definitely worth it as it provides a lot in a limited time. But I am not exactly aware of what you are expecting from this program so I cannot say with certainty whether this course will be worth it for you or not. What I am certain is that ISB Hyderabad has

• Excellently knowledgeable faculty
• Diverse peer groups
• Strong alumni network

So you need to understand your own goals and inclinations to determine the institute's worth.

Whether a course is suitable for a person depends solely on what he wants from the course and his priorities. You cannot generalize a course's value. Yet, in my opinion, it’s a course worth doing for everyone. Some points that speak in favor of this program are 

• Unlike the general misconception of IPM being lower in terms of degree, the IPM program at IIM Bodh Gaya offers dual degrees to its students (B.A (Foundations in Management) and a normal MBA). 
• Despite being a new IIM, it has carried the legacy of IIM and has proven its worth through its fast-paced growth and 100% placement percentage.
• IIM Bodh Gaya maintains strong international relations with world-class educational institutes like SolBridge International School of Business in South Korea and Montpellier Business School in France through its elite student exchange program
• Its location is one of the reasons many students choose it over other new IIMs. It’s located just 7 km away from the Gaya airport at a Buddhist tourist spot.

So IIM Bodh Gaya in general and its IPM program especially is worth taking.

The Bachelor of Business Administration program at NMIMS is pretty good and ranks 3 across the country. My brother completed his BBA from NMIMS Mumbai in 2016 and during his time the average package was INR 3 LPA. Currently, the median salary is INR 4.8 LPA. The companies that visit the campus for BBA placements are

• ACCENTURE
• Aircel
• Airtel
• Allahabad Bank
• Ambuja Cement
• Bank of Baroda
• Goldman Sachs
• Google
• HCL Technologies

You will have a lot of opportunities and the crowd is also talented in almost everything. Multiple internships offered mainly from Intershala are offered to students at different times. The timings can vary from division to division and depend on your semester as well.

Pursuing M Tech from RGPV university will not bring very favourable results. This is because the facilities are not of premium quality. Lack of good quality equipment will not let you complete the project appropriately. And most importantly this university is very lacking when it comes to placements. 

If you are willing to pursue M Tech then go for M Tech in IIT or top NITs like NIT Surathkal, NIT Trichy, NIT Warangal. These universities will provide benefits like well-informed faculty, study material, and elaborate funds for big projects. You may even go abroad for research programs.

Compared to the older IIMs it is not very good but compared to the newer IIMs it is way better. Its USP is its location in an Industrially rich belt that increases your chances of having an excellent career in Management.

Now if we compare it to the other B Schools, it ranks lower than FMS, XLRI, SP Jain, MDI and JBIMS but higher than IMT, IMI, Fore, XU, GIM, etc. It is better than these B Schools because of the IIM brand.

This program is best for people who want to enter the field of teaching and academics.