Hey VK K,
Kindly Mention the course in which you want to take admission, as it can help me answer your query in a better way.
According to your marks yor 12th percentage should be around 60% if you have 50+ marks in both Physics and Chemistry and around 50% marks if you have obtained total 50+ marks in Physics and Chemistry.

And with both 60% and 50%, you can get admission in almost all courses in private college and if you belongs to reserved category then it could be more beneficial for your admission.
Good Luck!