Hello Aditi,

If you want to get admission in B.Sc Biomedical Sciences Hons at Sri Ramachandra Institute of Higher Education and Research, Chennai you will have to first appear in the entrance examination conducted by the University.
And for applying the eligibility criteria says a candidate has be passed in HSC (+2) or equivalent examination with English and (i) Physics, Chemistry, Mathematics and Biology; (or) Physics, Chemistry, Biology or Botany & Zoology; (or) Physics, Chemistry, Microbiology/ Biochemistry, Biotechnology.
There is no percentage critical.

https://www.careers360.com/university/sri-ramachandra-institute-of-higher-education-and-research-chennai/bsc-biomedical-sciences-hons-course

I hope this helps.