Hi Reshma,
To write KVPY after 12th, you must have to be enrolled in any undergraduate program in 1st year. This is compulsory to be eligible for writing the exam in th SB category. So, its better to take admission in any college and then prepare for it. To check detailed information regarding the eligibility of KVPY 2019-20, check the official website. Here's the link:
http://kvpy.iisc.ernet.in/main/eligibility.htm
Good luck!

IISc Bangalore

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