Hello there. Hope you are doing good. I would like to tell you that the admission can be entrance based or merit based. So, depending on the marks secured in your 10+2, you can get admission in colleges which requires merit score. For entrance based colleges, you can check on college's website whether the entrance exam forms are available or not.

Else, you can also share the name of specific college so that I can help you better. I hope you found this answer helpful. Good luck for your future.