Hi Ayushmaan,

Though 12th marks are important for college admissions, it is not the only factor that is needed. There are many more streams other than Engineering and Medicine. Decide what your passion is, and apply for courses related to that. Many streams, like animation, B.Sc., Non - Medical, Nutrition and Dietetics, etc., do not demand for more than 50% of score. Any computer related courses have more scope and turn out beneficial later.

Above all, passion and skills are more important than marks. 

All The Best.