Hey there

You can choose any stream in 11th class as there are no specific courses mention for becoming an IAS officer. However there are various important subjects like history public administration political science, Geography, psychology, Sociology and economics which forms the main syllabus of general studies paper of UPSC IAS Exam so you can also pick these subjects:

For more details related to UPSC IAS click on below link

https://www.google.com/url?sa=t&source=web&rct=j&url=https://competition.careers360.com/exams/upsc-civil-services-exam/amp&ved=2ahUKEwj44rGsmPLyAhUMX30KHTkaB24QFnoECAoQAQ&usg=AOvVaw0YgHjPSGbCBqWgNlDAT28h&ampcf=1