I'm not sure what IIM/IIT is, but I would say that the math questions on the real test were pretty much in line with the last 15-20 questions in the OG (11th edition). However, they may have gotten a bit harder than these at times, and they were definitely skewed toward number theory, as has been pointed out before. I got a 48 math score, so if you're a real math whiz and get 49+ on it, expect them to be even harder. Also, I took the real test about 2-3 weeks ago, so my info is fairly recent.
Marcus