Extending on Zoomy's comments:
1. Does the school have a syllabus for the ground portion of the FIR syllabus ? If so, where the hell did they get it from - CASA does not have one, is not close to publishing one, and even CASA appointed ATOs are disagreeing among themselves as to elements of basic aerodynamic theory under the syllabus ? Or will the flight school be honest enough to tell you there isn't one but one is being attempted to be drawn up / in the pipeline ?
2. Does the school have a syllabus for the flight portion of the FIR syllabus ? If so, what do they base it on ? CASA's Flight Instructor Manual ? If so, are they aware that there are a number of errors in that handbook ? Are they able to point out what these are ? How do they intend to resolve such errors with CASA at test time ?
3. Are there dedicated instructor(s) involved in delivering the FIR course, or are other instructors also pulled in ad hoc ? Are the "dedicated" instructors aware whether they are teaching the same course content ? Talk to each of such "dedicated" instructors - do they agree with each other on every aspect of the syllabus ? It's too late if you only find out on the course.
4. How do they intend to teach aspects of PMI ? Regurgitating verbiage from FAA's Instructor Manual is hopeless. Do they talk about theory devoid from practical instruction ? Ask to sit through one of their FIR briefings and note how they actually teach and what the students are getting.
5. What materials do they recommend students besides Bob Tait or Trevor Thom ? How do they know whether such materials cover the syllabus in the appropriate depth ? Do they prefer FIR students to do whiteboard briefs (the usual complaint is they take too long to put up) or on PowerPoint (the usual complaint there is that an audience cannot cross refer to different parts for confirmation of understanding). Is there really such a thing as a winning formula ?