For doctoral studies, normally the PI has sufficient funding to support the student, but in its absence a fellowship via the National Eligibility Test conducted by the University Grants Commission or such student support schemes makes the applicant's case strong.
In doctoral programs, the PI usually covers the student's expenses. However, if funding falls short, a fellowship from the National Eligibility Test (NET) administered by the UGC or other comparable student aid programs can make the candidate more competitive.