I was reading this post (
https://permies.com/t/364002/DIY-School) and my memory was jogged.
I had to take a state licensing test that had test questions way out of the scope of work I needed to do. I was getting the license for a specialty trade that went from not requiring a license to requiring a license in 2023.
I found this youtube channel below to be very informative and helpful. Now the guy has an online training course (but still has a ton of free videos on youtube). Watching some of the videos on the more advanced subject matter was a key to passing the test.
I would start here if you need some clarity on DIY electrical questions.
https://electricianu.com/online-electrician-programs-and-courses/
https://www.youtube.com/electricianu