hi,

Admission to phd course or integrated phd course in iits or iiser or iisc bangalore is based on gate score, applicants may also apply using ugc net/ inspire fellowship etc. however the cutoff score varies institute wise and subject wise. also candidates must have good academic records . for example the criteria off IIT delhi phd courses is as follows:

candidates with  M.Sc./MBA/M.A./MBBS or equivalent degree must secure   60% marks or 6.75 CGPA on a 10-point scale  with valid  GATE score >= 300 or qualifying or equivalent score whichever is higher CSIR/UGC NET/ICAR/ICMR/DST INSPIRE fellowship. follow the article at below link to know in details:

https://academics.iitd.ac.in/content/minimum-qualifications-admission-full-time-phd-programmes#:~:text=For%20SC%2FST%2FPH%20category,requirement%20from%20300%20to%20200.

IISC bangalore gate cutoff for phd courses is as follows:

https://iisc.ac.in/wp-content/uploads/2021/01/final-cutoff-research-02072020.pdf