Y:

Please refer the following link:

http://www.igidr.ac.in/newspdf/advt2013.pdfIts clearly stated in this file that:

"The written test for both M.Sc. and M.Phil./Ph.D. will emphasize general aptitude,

analytical ability and mathematical skills at appropriate levels.

**In addition** M.Sc. students will

have the option of answering a section either on Economics or Mathematics at the

undergraduate level."

So, prepare for both Economics and Mathematics.