Hey!
To become IAS, you must satisfy the qualification criteria for same and that involves an undergraduation degree with minimum age of 21 years. You canapply for IAS exam only after you have completed your undergraduation degree. Also, the syllabus of IAS exam includes the syllabus of undergraduation degree generally. So, you must prepare well for your 11th and 12th exams. And later on, when you are pursuing your UG degree then you can do preparation for IAS exam side by side. For more information, you can check this article:
https://competition.careers360.com/exams/upsc-civil-services-exam
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