Hi Srishti,
M.Sc. is a two years course which comprises of 4 semesters
You want to get into Savitri Bai Phule University, Pune into M.Sc. Course, the university itself conducts entrance exam to its M.Sc. programs for which you might check how to apply and the Eligibility criteria for the same from the link provided below : https://campus.unipune.ac.in/CCEP/Documents/Circular1_30042019.pdf
And from here you may get your application registered overe the link here : https://campus.unipune.ac.in/CCEP/Registration.aspx
Hope it helps :)