For admission in BSc course most colleges need you to score about fifty percent in class twelve in science stream. Some good colleges may ask for sixty to seventy percent marks depending on the subject and popularity. You can check exact college cutoff and percentage required on Career360 here

https://www.careers360.com/articles/percentage-required-for-bsc-admission

Hello,

For B.Sc admission , most colleges ask for at least 45% to 50% marks in 12th. But top colleges may need 60% or more, depending on the course and cut-off. It also depends on the category and college rules.

Hope it helps !