Hi jay,
If you want to apply for 2018, you are late. Since application for phd in iisc, banglore were invited in february-may,2018. They are short listen on behalf of their interview and marks in JAM.
You can visit http://www.iisc.ac.in/admissions/ph-d-integratedprogrammes/#ffs-tabbed-22 for more information.
Good luck...
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