If you have a background in engineering - especially electrical - you have a huge advantage over those who don't. I breezed through all 3 tests, but now I realize how much of that was due to the EE education; my wife is going through the book preparing for technician test, and even basic stuff like she metric units of measure prefixes (milli, micro, nano, etc.) are new to her.
Well yes. I was a Navy Radar tech for 4 years. And even though I was Radar, they sent me to R1051 Receiver school. After I got out, I changed my Major from Organic Chemistry to Electronics Technology, Majoring in Computer Hardware. While going to school I worked and learned transformer design, OJT. My main client was Schlumberger. Once I got my BSET, I never worked hardware. I spent 31 yrs as an integrator, tester, CM, and QA, supporting the Space Shuttle.
Years after I had gotten my BSET, I walked across the street to the College of Engineering and talked to a counselor about going for a MSEE. Well they hit me with around 32 hrs of prerequisites. I took that course list and went right to the bookstore and looked up the course books for each class on the list. Turns out for almost every class on that list, I had taken a Technology course using the same textbook. Its hell when one college refuses to recognize the course work using the same books, but not from Their College. I never went back. I came close to going back in the Navy as an Officer, but I came to my senses.