Hy,

If you are planning to pursue Allied Science courses you must belong to the science stream (https://leverageedu.com/blog/science-stream/) . Biology is an obligatory subject for certain related medical disciplines. Some good institutions give admissions in the course based on your marks in 10+2. Therefore, a high aggregate percentage will help you secure a good college. Most institutions demand a minimum of 50 per cent or above in aggregate for admission to their undergraduate courses.

Many Indian universities conduct their own entrance examinations as a part of their admission process.