You have many good free preparation Materials for IPMAT available over the Internet as well as on Amazon and other E Commerce Websites. You may even take help of Youtube Resources like 2IIM as well as Edtech Platforms like GradeUP, HitBullsEye and Unacademy. Later on however, you may opt for IPMAT test series or crash courses from Coaching Institutions like Career Launcher or TIME either in Offline or Online Mode.