Hi Arya!

There are numerous coaching institutes for IPMAT and JIPMAT exams in the market some offer there online course where live classes are conducted while some offer their pen-drive course and then there are regular coaching institutes.  I do not know much about VPROV and IPMcareer but i can definitely tell you about TIME. One of my friends joined TIME for preparation of IPMAT taking his brother's advice who was once a student at TIME when he prepared for CAT and he did his MBA from IIM Lucknow. My friend joined TIME's offline classroom program and he found it good they provide regular mock tests and their faculty is very experienced and they provide you with their own study material which has questions that were asked previous year in exams. Although my friend could not make it through IPMAT and he is currently at Christ University, but TIME is good. In the end all that matters is your hard work and determination and practice and the way you approach your mocks and work on your strong and weak points accordingly.

I hope this answer helps you.

If you want to join one of the Indian Institute of Management by giving IPMAT, the the best coachings that you may take admission in are:

TIME
Career Launcher

The faculty in both of these are highly experienced and the results are awesome every year with many students of 100 percentile category belonging to these two institutes. Hope you can take an informed decision after this.

All the best!