Hi there,
For IISC , if you want to pursue b tech then you need to give jee mains and a separate paper for IISC, if you want to pursue msc then you must clear KVPY exam.
For IIST, IISER you have clear both jee mains and jee advance with a good rank. For Niser there is separate paper you need to clear that.
I hope this help
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