Let’s make this easy to understand by comparing what you will be earning in 2 years if you continue to work here and the average package you might be offered after completing an MBA of 2 years.
Your current salary is 13 LPA. So in 2 years, you will be earning around 16 LPA. The average salary of IIM Raipur is INR 17.73 LPA. Now if you compare the two you will see there isn’t much difference between the two. In fact, if you go for an MBA you will end up with an extra loan. Paying back the hefty loan is itself a big task. So, in my opinion, you should continue working in the firm.
If you really want to pursue MBA, prepare for CAT next year and aim for an older IIM as it might improve your opportunities. Then again go for CAT again only if you are confident that you will
be able to ace it.