IPMAT

IIM IPM is always scheduled between 12th to 16th May, so either join a local Time institute nearby for doubt clearing and help, or you can study with internet by solving Mock papers of previous year IPM paper. You'll need to be constantly updated with your GK. Keep your vocab up to date and be comfortable with qualitative or quantitative ability.
3 months dedication with proper and honest mock paper solving a bit of help from your teachers in math or other quantitative skill questions regular GK and dedication will be enough for Iims IPM exam. On internet, there is more than enough IPM material, which can be very helpful. But, if your basics are weak, then you can also join a coaching class nearby maybe Time institute.

If you have a decent grip over Maths, Logical Aptitude and English, IPMAT should not be a hard nut to crack. The questions asked in Maths section range from moderate to difficult on the difficulty scale whereas the ones asked in English were all more or less moderate or easy. The question paper usually consists of 60 questions from Maths and Aptitude and 40 questions from English, any person who managed to make 40+ attempts in Maths and 30+ attempts in English with an accuracy rate of around 80% could make it through the AT. However, the IPM interviews are never predictable; and when I say IPM interviews, I mean the interviews themselves as well as their results. You cannot refer google for interview questions and walk in for the interview with the hope of converting the call. You can be grilled on topics like details of your fathers occupation and your knowledge about the same as well as on topics like the proof of lying between 2 and 3. It depends on you. But also the interviews, they are likely tailored for you. Every question asked to you is a function of your personality and your past. So, it all depends on you. One thing that you can be sure of is that they essentially look for nice communication skills. In case you are interested in knowing how tough is it, the selection ratio is about 0.1%, so give your best. For more information and talking to IPM participants directly, try Kriger Campus. So if you have a good grip or are commendable on the above subjects, then IPM is a piece of cake. However CAT on the other hand functions in the same way, but somewhat tougher than IPM. Good luck. All the best for your future endeavours.