Hi koti

OC means open category / general category. It doesn't matter whether you belong to open ,OBC SC or any other category, you can still become an IAS officer.

Now,

In order to become an IAS officer then  you need to be a graduate in any discipline  and at least 21 years old and then clear  UPSC civil services examination which consists of three stages listed below :-

*prelims exam :- it is objective paper and is of qualifying nature , so you just  need to at least qualify it to be eligible for mains examination, the score /marks obtained by you in your prelims examination is not added up or used in your final merit. Your prelims exam consist of 2 papers: -

-) general studies  1

-) general studies II ( csat )

You get 2 hours for each paper

*Mains exam. :- it is descriptive /written examination . There are a total of 9 papers  which are listed below:-

-) compulsory indian language.

-) english

-) essay

-) general studies I

-) general studies II

-) general studies III

-) general studies IV

-) optional I

-) optional II

*Interview :- After qualifying mains, you have to go through interview round, and it is more of test of your personality rather than knowledge.

If you managed to sail through all the three stages  then you can become an IAS officer depending on your rank in UPSC, your category etc

For detailed information check out :-

https://school.careers360.com/articles/how-to-become-an-ias-officer

But yes,

Qualifying UPSC is not that easy you will have to study really hard and be determined, for preparation tips go through

https://competition.careers360.com/articles/how-prepare-for-upsc-ias

Thank you