I will admit I was skeptical at first, but I wanted to give the written test prep course a honest try. I watched all of the videos and took notes during each one (as if I was back in school). It took me about 12 days (1-2 hours ever day or two) to finish the entire ground school. I took the three required practice exams, then did two additional "randomized questions" exams. I reviewed and took further notes on any missed questions each time (this is important!). I studied my notes for about 90 minutes (45 minutes one day, 45 minutes the morning of my exam). I did not do any 'on my own' research or use any other reference materials - I did not read any of the other IFR prep books, etc - I only used the King ground school program (and I realize this looks like a fake review or that they told me what to do/say, but that is NOT the case). I really wanted to know if I could rely on the King method to take me all the way to CFI, so this was kind of a litmus test to that effect. Long story (and review) short, I am very pleased and earned a 95% on my written test (first time)! I am already signed up for their commercial pilot ground school and test prep program!
Instrument Rating Ground School & Test Prep