Hey Bhavik,
MiM is a great option for anyone with 0-2 years of work experience.
A lot of Tier-1 universities like Duke, Michigan, HEC Paris, Cornell offer this program and the weighed salaries can go as high as 142k per annum depending upon the school and the industry.
Now, here are a few things that you should keep in mind-
Whether you should go for an MiM or MBA is more a question of your career goals than retaining your GMAT Score.
An MBA from a good college would need some quality work experience of 3-5 years. Do you wish to accumulate work experience first and then enter the workforce at Mid-Senior level?
Or do you want to fast-track your career progression with an MiM and enter the market at an associate level?
A lot of applicants face the same dilemma of choosing between an MiM and an MBA.
This is a pretty good resource that highlights the exact differences between the two degrees and helps you decide which one is a better fit for you, check it out:
https://www.mim-essay.com/mba-vs-mim/ Also note that although GMAT scores have a validity of 5 years, it is not a good strategy to use the same scores after 2 years.
Regarding the ROI, the weighted salaries from most of the good schools ranges 65k to 114k per annum. An average MiM graduate takes roughly around 1.5-2 years to recoup the investment.
Lastly, by the rule of thumb always study in a country where you want to work in the future. For any Masters degree, be it MiM or MBA, you should aim to work where you have studied for at least 2 years. Your job prospects in your home country would depend a lot of your degree+ your 2 years of work experience.
So yes, you have a lot of new information so I would suggest you to carefully think about the above pointers and decide which degree is better suited to your career goals.