Various publications promise to help aspirants for IPMAT examinations with their books. In reality, these books are not worth your time. I believe that the syllabus for the IPMAT is at a similar level as that of CAT. So, it would be better for you that you buy popular books which aspirants use for the preparation of the CAT examination.
There are two sections in IPMAT - Quantitative Aptitude and Verbal Ability. To prepare for these sections, you can buy Quantitative Aptitude and Verbal Ability by Arun Sharma. Solve the LOD 1 and LOD 2 exercise available in the book.
It must be noted that books solely cannot help to cover the entire syllabus. You can additionally sit for Mock tests, communicate with mentors for insights and analyze the previous year’s papers. This will help you to get an improved idea about the fundamental structure of the examination.