Hii!
In order to become an IAS officer, there's a long way to go for you. You will have to clear the UPSC entrance exam in order to do so. The eligibility criteria for the exam states that the candidate must have completed graduation degree with minimum 50% marks in any subject stream from a recognised University.
So, it's fine if you took PCM Subject ombination in class 11. You can complete your class 12th with science stream and then go for graduation in the subject of your choice. Meanwhile keep preparing for the exam. After you complete graduation, apply for the UPSC exam and move ahed as per the requirements.
Hope this helps.
Good luck!

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