Hello Syed
To become an IAS you have to give the Civil services exam conducted by UPSC every year. The minimum eligibility criteria ot give cse is that you are undergraduate. It doesn't care about which course you had done. All the graduate students can give UPSC CSE only if they fulfill the criteria of number of attempts and caste and age. The CSE consists of three stages .
You have to clear all stages in order to become an IAS officer. For this you have to study according to the syllabus of CSE. For Mains exams, you can opt your optional subject according to your undergraduate degree.
Hope this helps.
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