Hi Utkarsh! 

Believe me, it's the best time to start your preparation for civil service!! You have 2 and half years to study.. If you plan properly, you can clear UPSE in your first attemt!! It doesn't matter, what degree you are doing. It's your dedication towards the goal reaches you to the goal!!

 I will explain, what I will do if Iam in your situation.

1. First I analyse my self about, 
Why I want to become civil servent ( 15 days). By the end of 15 days, I will have my goals after becoming civil servant. 

2. As a second step I go through the detailed syllabus of the 3 rounds of the exam. ( 1-2 weeks ) 

3. My third step will be clearly analyse the question papers and understand, what I have to focus more and what not.... ( 1- 2 months)
It's very important step.

4. Now I start reading Hindu news paper almost 1 hour/ day. Remaining time I'll spend with NCERT books. I also start spending my weekends in some of nice websites and magazines for UPSE. ( 6 months )

Oh... Don't you have time to do all these?... Come on !! Many people includimg me do all these while working. And student life is much better than working. 

Still you will be havimg more than 1.5 years !! 

5. Now you'll be comfortable with basics. This is your second phase of studies... 
Go through the blogs of toppers. You'll come to know, what are the reference books, you have to study. 
Prepare those!!

All the best 

Sorry for spell and grammar mistakes. I typed it through mobile... 
I spent considerable time to type it. Hope it is useful.....

Please upvote if this was helpful to you. 

Thank you and good luck.