Hello Jagdish,

Here's a list of coaching centers that provide preparation for IPMAT-

TIME, IMS, Career Launcher. These are the leading coaching institutes in this field. you can also go for Pratham online. It is one of the best online classes for IPM.

As far as preparation is concerned, it is not the case that once you join the classes everything will come to you walking. Self-study is really important. you should form a group of friends who are preparing for the same exam and discuss the problems which you are facing.

Good luck!