Instrument Ground instructor Test
Could anyone recommend a study program/course that is best for preparing for the Instrument Ground Instructor? It has been several years since I took the instrument written and would like to now add the Instrument Ground Instructor as a rating. I have looked at Dauntless and Preparetotest.com and am still loking but was wondering if anyone out there is actively reviewing material for this test. I am also looking to add the Advanced Ground Instructor and would like to have some help on what course is best for that as well.
In years past I took the ATP and Flight Engineer written with sheppardair.com and really enjoyed that program. I was hoping to find something similiar.
Many Thanks,
Morriskav8