To become an IFS officer you need to qualify the UPSC CSE examination. The eligibility for this examination is that you need to be a graduate in any subject. So you can study any subject which will make you eligible for UPSC CSE. Now for being an IFS you need to score good in your UPSC CSE examination and for that you have to prepare well for the UPSC syllabus. So you can do graduation in any subject there are no restrictions about it. To be an IFS officer you need to study well for UPSC.

To know more about UPSC CSE visit the link below:

https://competition.careers360.com/exams/upsc-civil-services-exam

To know more about the career of IFS visit the link below:

https://www.careers360.com/careers/indian-foreign-service-officer

I hope this answer helps. All the very best for your future endeavors!