My recollection is that if you did M1 and the Student Hat, then you were a Fast Flow Student, which meant that you didn't have to do star-rate checkouts on materials that had a star next to them on the check-sheet - you could just sign them off.
If you did the Primary Rundown (look up all of the words on the Student Hat course, one by one, in alphabetical order, from a pre-prepared list) and then did the Student Hat, then you were 'super-literate'. I think that, technically, the Primary Rundown INCLUDED a study of the Student Hat after the word clearing. Also, the wordclearing wasn't done Method 1, it was (if I recall correctly) Method 8, which just means clearing words from a prepared list of words on a subject.
I don't think Method 1 was usually done on a particular SUBJECT. My recollection is that M1 was normally done as a general clean up of your past education, and so included looking for misunderstood words and symbols (MUs) on ANY subjects that you had studied in the past. So you couldn't do an M1 on a subject that you haven't yet studied, because you wouldn't yet have any MUs on that subject to clear.
Then the Primary Rundown just sort of disappeared - nobody ever mentioned it in the 90s. It didn't seem to have been cancelled. Just nobody did it. I know of a couple of people who did it maybe around the late 80s/very early 90s. It almost drove them nuts.
Then the Key to Life course came out in the early 90s, and one of the early parts of that course involved a lot of clearing of small words, followed by learning grammar, and some Clay Table Processing. I actually enjoyed that course - or I would have done if I hadn't been under such pressure from CMO Int to complete it.
I'm surprised they didn't keep the Primary Rundown going mainstream, to be done after the KTL and Life Orientation Course, and maybe after Super Power, so as to make you super-duper-duper literate. It's always handy to have another layer of super-duper to keep people busy on course. Logically, it SHOULD come after the KTL, after spending all that time wordclearing small words and learning grammar.
I think word clearing is useful. What is NOT useful is focusing on wordclearing as a thing in itself, for its own sake. Sitting there reading a dictionary isn't going to make anyone superliterate. I think it worked quite well on the KTL, but that only involved common small words.
But when I got to the LOC, that's where things got sticky. Being on staff, having to figure out your 'hat in life' on the LOC, and realising that it didn't involve being on staff, led me [notice I can spell the past tense of 'lead' properly - half of the English-speaking world doesn't seem to be able to, hehehe; I'm not attributing that to the KTL!] into quite a bit of mental gymnastics and fudging of the rest of the course.
I think that looking up words is valid and useful. But the panic about MUs that the Student Hat can instill can ruin a person's study habits also. I remember being scared to look at advertisements on the roadside, on the way to course for the KTL, for fear that I'd encounter an MU. I still don't really bother with fiction, and I think that's partially because of the emyouphobia that I had when I first left the church.