Hello student to become an IFS(Indian foreign service) Officer you need to appear and clear UPSC examination which is divided into three stages Preliminary, Mains and Interview.

You need to just fulfill the eligibility the criteria to appear in UPSC which says - Candidates must hold Bachelor degree in any discipline from a recognized university.

You can pursue graduation from any college there's no particular college from which you should pursue your graduation.

Feel free to comment if you've any doubt

Good luck