Indian Foreign Service is a Group A and B level exam for which anyone with a graduation degree can apply. For applying this exam you have to fill the UPSC (Union Public Service Commission) Civil Service examination form. While filling the form you have to select your option as foreign service as there are other services as well which fall under this form like IAS (Indian Administrative Service), IPS(Indian Police Service), IRS(Indian Revenue Service), Indian Foreign Service and  IFS(Indian Forest Service) but they conduct their mains exam separately.

The form fill up for the Civil Service Examination was ended yesterday, and I am hoping that you are planning to appear it on next year so do study and prepare yourself and fill the form next year.

Best of Luck.