Hi Manan Jain,

                        I am a present IPM student and I would suggest that just the sample paper given is more than enough. You can try some aptitude and language questions online. For the interview you may reach out for a coaching centre if available. 

For the quantitative aptitude section you can check out books of Quantitative ability by Sarvesh Verma and for verbal ability check out the book word power made easy by Norman Lewis and try to read some newspaper editorials. 

Apart from that get hold of the past year questions and you can have an understanding of the type of questions asked and the topics you need to focus on. 

All the very best