Yeah, Online Resources from Edtech startups like Unacademy are one of the best platforms for preparation for Examinations like IPMAT besides test series from some of the Good CAT Coaching Institutions like TIME or Career Launcher. You should also refer CAT Books, if required for a stronger preparation.

For more information about IPMAT and Preparation Tips do follow the link below

https://bschool.careers360.com/exams/ipmat/amp