Hi Bharti,

Hope you are doing great as per the question asked by you yes you can can start preparing for UPSC exam in your graduation also as such boundation is not there. Yes you need to manage your college studies and preparation together and yes you have to spend more time in college preparation rather then spending more time on your graduation syllabus. And yes it is necessary to read all relevant NCERT books for preparation as NCERT is very standard book which gives very good overview.

Hope you found this answer useful.Stay motivated stay positive.

All the best!