This is from IIT JEE 1999. If i remember this was one of the most difficult Math paper in those years.check out question 11 at the end , nice one.
Trivia: Check out JEE 1998 paper on physics & try out subjective questions at the end.Boy was that paper hard.
in 1998, we used to aim for 50-60% on all 3 (P,C,M) to get in top 500 out of total ~2500 seats - all india topper that year scored himself at 85% (they just tell you the rank you have to score yourself later).