A couple of days ago I came across this post by Bob Meder, the chairman of the board of National Association of Flight instructors (NAFI)
Most CFI applicants around the country prepare for the CFI checkride in the same manner like they did for all their previous checkrides. And unfortunately, many Instructors are teaching CFI applicants using the same methodology. Teaching a pilot applicant and teaching a Flight Instructor applicant is not the same thing.
Obtaining a US FAA pilot certificate (license) and a Flight Instructor Certificate, when you hold foreign pilot and instructor licenses is possible. The following procedures