Hi jeeya,

It's only possible if you pass your std 12 from e a recognised board in pcb because they clearly mention that you need to score more than 60 % apart from the prescribed cut off to get a college.

You can reappear in board exam as an improvement and change your subjects. Then you can surely sit for the examination. For this you need to talk your school authority of std 12 ,vas in they need to register you for board. Probably i think it's not possible right now as registration takes place somewhere between August to October in different boards.

Best wishes : )