It seems like this is just problem-solving content taken from videos that have separate learning sections. There are many instances where they skip over things saying "We know this from studying it," "We studied this before," or "This is obvious." For some problems, they say "This is difficult, but since the same problems appear due to the nature of the processor technician exam, it would be good to memorize them as problem-answer pairs," while for others they explain "This option also appears in the practical exam, so it's good to know." The lecture standards differ from problem to problem. Additionally, When the answers are in English but they give the answers in Korean and move on, that doesn't seem right.