hi,

Every year iits conduct iitjam exam, which is one of the prestigious m.sc entrance exam of India. however apart from this UOh entrance test, bhu entrance exam, jnu etc are also applied by many of the aspirants. so basically you first check the university website, read detailed instruction dates every thing. while filling the form you must have necessary documents like educational certificates, aadhar, pand card etc. you may follow the below link to check the previous years prospectus:

http://acad.uohyd.ac.in/downloads/PROSPECTUS_20_21.PDF

for 2021-2022 session application date has not released yet. now that you have to follow official site to get updates.