Hello Aspirant..

There is no limit to how many times you can try. Candidates seeking for a Junior Research Fellowship (JRF) should be 28 years old, according to the CSIR UGC NET eligibility criteria. Lectureships have no age restrictions. Candidates must have an M.Sc. or similar degree, or an integrated BS-MS/BS-4 year programme, or a BE/BTech/BPharma/MBBS degree with at least 55 percent for General (UR) and OBC candidates and 50% for SC/ST, Persons with Disability (PwD) candidates. B.Sc(Hons) or equivalent degree holders or students enrolled in Integrated MS-PhD program with at least 55% marks for General (UR) and OBC candidates; 50% marks for SC/ST, Persons with disability (PwD) candidates are also eligible to apply.

I hope this information helps.

Regards.