Hello,
You are you are not eligible right now.
Reason: JEST Physics and Integrated-PhD/PhD programs in physics require Physics as a main subject at the bachelor or master level. Your BA (Mathematics + Economics) does not meet this requirement.
Admission to I-PhD at ICTS / IISc / IMSc:
You cannot get admission directly with your current degree.
These institutes expect a BSc or MSc in Physics (or equivalent).
Hope it helps !
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