There is diffrebt exams for diffrent colleges so firstly decide for wchich collehe you want to go for. SO That i can provide you the full information regarding this. All the best. 

Respected Sir/Mam,
It depends from college the college. Mumbai University affiliated colleges and Xavier college take admission through board marks . symbiosis take admission by their own exam. I would recommend you to study hard and get really good grades in your boards so as to get a good college seat.