India does not have special grooming programmes for such international events , most kids in senior high school are busy preparing for entrance exams for top engineering and medical colleges which have a specific course and syllabus , doing well in IMO would get you laurels in India but not admission into a top college , hence hardly any student prepares specifically for such events and one cannot think of getting a top 10 rank without specifically preparing for IMO.
If you're looking for some real path-breaking work in the field of mathematics then just yesterday i read a news about an Indian mathematician Nikhil Srivastava winning 2014 Geroge Polya Prize for finding a solution to Kadison Singer conjecture .
1971 Ronald L. Graham, Klaus Leeb, B. L. Rothschild, A. W. Hales, and R. I. Jewett
1975 Richard P. Stanley, Endre Szemerédi, and Richard M. Wilson
1979 László Lovász
1983 Anders Björner and Paul Seymour
1987 Andrew Yao
1992 Gil Kalai and Saharon Shelah
1994 Gregory Chudnovsky and Harry Kesten
1996 Jeff Kahn and David Reimer
1998 Percy Deift, Xin Zhou, and Peter Sarnak
2000 Noga Alon
2002 Craig Tracy and Harold Widom
2004 Neil Robertson and Paul Seymour
2006 Gregory F. Lawler, Oded Schramm, Wendelin Werner
2008 Van H. Vu
2010 Emmanuel Candès and Terence Tao
2012 Vojtěch Rödl and Mathias Schacht
2014 Adam Marcus, Daniel Spielman and Nikhil Srivastava
The George Pólya Prize has a total of 3 Chinese winner but just one Indian got it as late as this year. More remarkable is Terrence Tao, a Chinese, who is most widely recognize as the greatest living mathematician today, not only win this prize but won almost every single important mathematical prize.
Right now, he is solving Navier Stokes, a fluid mechanics problem (in conjunction with many many other important and seminal problems) which, with a stroke of luck may bring him a Nobel Prize as he has in reality, crossed into physics domain.
Salem Prize (2000)
Bôcher Memorial Prize (2002)
Clay Research Award (2003)
Australian Mathematical Society Medal (2005)
Ostrowski Prize (2005)
SASTRA Ramanujan Prize (2006)
Levi L.Conant Prize (2005)
Fields Medal (2006)
MacArthur Award (2006)
Fellow of the Royal Society (2007)
Alan T. Waterman Award (2008)
Onsager Medal (2008)
King Faisal International Prize (2010)
Nemmers Prize in Mathematics (2010)
Polya Prize (2010)
Crafoord Prize (2012)
Simons Foundation Award (2012)
Joseph I. Lieberman Award (2013)
Breakthrough Prize in Mathematics (2014)