Business Management Studies

Time institute near by 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 knowledge 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. Personally, I feel coaching is not required for IPMAT as the kind of questions which are asked cannot be prepared per se. One can only work on their speed and ability to tackle questions differently. I would suggest an aspirant to take a correspondencecourse or a test series. For that any reputed coaching centre should be ideal. Still, I would recommend against taking coaching classes for IPM as they are really not worth it.