Hii Sridhar!
You don't need to join civil ourses in order to clear UPSC and become an IAS.  You can join any bachelor's course of your choice and prepare for UPSC by yourself. The eligibility criteria to become and IAS states that the candidate must have completed graduation from a recognised university in any subject stream. So Yes, you can take admissions in BA and like courses and self prepare for UPSC.
Hope this helps.
Good luck!

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