Hello Aspirant  ,

Yes , You can be an IAS officer after choosing PCMB (physics chemistry mathematics and biology) in your class 11 and 12 , it does not matter what stream you choose you can be an IAS officer if you clear UPSC CSE exam with a very good rank (less than 90 for a general student ).

Other eligibility criteria are

• Your age should be between 21 to 32 if you are general student .
• You need graduation degree from any stream from a government recognized college

Hope this helps.