I should clarify, EF doesn't offer Cambridge exams to their students. Some branches offer the TKT test to any FTs who want to sit it as it is a requirement for the LTs employed to sit the TKT, so FTs can too should they so desire.

EF offers training in IELTS, but not in C-ESOL exams. At least the two I worked for didn't... Although it would good if they did