Greetings !!

You need to clear UPSC Civil service examination to become IAS officer. You can start preparation as early as possible . I would recommend you to join in a coaching institute and follow a systematic study plan after your 12 th. Now you can concentrate more in your 12th board exams, focus on the current course, if you score better marks in 12th, then only you will be getting admission in Good colleges and that too under " Merit ".

During your college first year on wards , join nearby institute and prepare well. As upsc is not a cake walk, you need to put your heart and soul into the preparation.  Stay focused, prepare with dedication, Definitely you will become an IAS officer. I wish You all the success in your future. If any doubts, pls feel free to ask!.

Thank You !!