You should have a plausible reason justifying your guide change during your Ph.D. at IIT Kharagpur. One such reason can be very slow progress or laid back attitude. There might be any other compatible issues as well that might hinder your progress in getting the required training for a Ph.D. degree.
Once you are certain that your reason is one that needs to be addressed, present your stance to your Head of the Department, who will call a meeting of your doctoral scrutiny committee (DSC). You will be asked to present the case in front of the DSC members and your guide who has to agree to release you from his guidance. Once you have been released, another faculty member of the same department should volunteer to take you under his umbrella.
Concludingly, there are 3 major requisites for Ph.D. guide change
These may look like simple steps but sometimes can be very difficult and challenging.
The first step in the journey of getting a Ph.D. degree is giving either of these exams; GATE, NET, CSIR, or UGC. Next, you have to decide on a particular field in which you will be conducting your research. After this, you have to look for a faculty advisor that has experience in the kind of research work you are looking for. His teaching style should necessarily align with your learning style. Conduct extensive research on the topic you will be working on.
IIT Bombay: Here, you are required to do some coursework on the topic you have chosen. Choose the course that will give you more opportunities than others. Most Ph.D. students take some courses only to make up the required credits. This is not right as you will miss the opportunity to learn so much from every department. The most preferred courses are CS and Modelling at IIT Bombay.
One can even upgrade their skills in Mathematics and Statistics. Other courses that might help you in research work are fluid mechanics, soil mechanics, inorganic chemistry, solid-state physics, and thermodynamics.
Basically, you should choose your coursework not only for credits but to get knowledge of the research work you will be doing. Seek help from your advisor on the same.
The basic differences between MR at IIT Madras and Ph.D. at IIT Madras are
Despite these differences, the general routine and schedule of both MS and Ph.D. are similar. Ultimately, more than your program, your research topic and performance will matter.
The IPM course in IIM Indore used to be a diploma course and earlier it was not possible to do a Ph.D. after graduating. But now because the five-year integrated IPM program is a degree course, you can easily enroll for Ph.D.
To the best of my knowledge, if you are a commerce student you are not eligible for the IPM entrance exam that is IPMAT. Commerce students with maths as a subject are still eligible for the paper. The IIM authority has clearly stated that maths has to be a compulsory subject in class 12th to be eligible for IPMAT. It is a primary criterion. You can also be eligible if maths is an optional subject instead of PE or CSC.