Hi

To become a collector you need to become an IAS officer and for that you need to clear UPSC civil services examination

After your 12th,

You can choose any subject or course like BA, Btech, Bsc, bcom, Mbbs etc based on your interest for your graduation/degree

This is because,

to be eligible for UPSC  examination there is no compulsion to be a graduate in a particular subject, all you need to be eligible is that :-

You should be a graduate in any discipline and 21- 32 years old . You can check upsc eligibility criteria at https://competition.careers360.com/articles/upsc-ias-eligibility-criteria/amp

But yes ,

When it comes to upsc preparation and if you are totally focused towards it  then ,

choosing BA can be really helpful for your UPSC  examination, this is because in BA you will be learning subjects like history , polity etc which are a part of the UPSC syllabus so it will help you in your upsc examination

Some of the best graduation courses regarding upsc are :-

----------)  BA Public Administration –   Highly relevant,  it has compact syllabus, it has a lot of overlaps with your polity & governance part in your GS II.

----------)  Ba     Sociology – it's   study of society, lots of material are useful  in GS I, Essay, in Ethics paper as well.

----------)   BA     History   – useful for prelims and your GS I.

----------)   BA Geography   -relevant for both prelims and GS

----------)  BA Political Science   – relevant for both prelims and GS II

Some other options are are BA Economics,BA Philosophy etc.

So, take your time and decide.

To help you further, here's a brief of your UPSC examination pattern

Your UPSC civil services examination consists of three stages

********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

The compulsory indian language and english are qualifying in nature . You just need to qualify them. The marks obtained by you in these two papers will not be counted towards merit list.

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

For detail examination pattern check out :- https://competition.careers360.com/articles/upsc-ias-exam-pattern

Thank you