When considering whether to attend a new or "baby" Indian Institute of Management (IIM) or a more established one, there are two key issues to consider.
Firstly, it is possible to graduate from a new IIM and secure a job that pays significantly more than your current 12 LPA job but it will depend on your performance in business school, and the better-established IIMs will have a greater probability of making this happen. For example, if you attend IIM Trichy or IIM Ranchi, your chances of securing a higher-paying job will be higher.
Secondly, and more importantly, the question is whether you should join a new IIM in your first attempt if you are already holding a 12 LPA job. It is recommended to take the Common Admission Test (CAT) again and try to get into a better college, preferably one of the top 6 IIMs or other reputable institutions such as FMS, SP Jain, or MDI.
This will provide a greater opportunity to secure a higher-paying job in the future. While it is true that a new IIM may offer good opportunities and placements, the chances of getting a better placement are higher in more established institutes, it is better to aim for these institutes on the first attempt.