The Michigan workout is pretty simple to understand although Ron never really explained it to us walk-ons back in the day. Yes, Michigan used to allow walk-ons and those days are gone. I finally understood what was going on when I read Lear's book on Alan Webb's days at Michigan as Lear explained the workout as per Warhurst or whomever.
Basically it was meant to simulate a 10k race. You would start out with a mile on the track which was supposed to be similar to your first mile of the race - faster than average race pace in order to get out from the pack. As opposed to recent Michigan workouts that I've seen on youtube, we never stopped to rest. We did jog easy from the finish of the mile to the parking lot next to the track (about 200 meters total) and that was to group back up. From there we would pick up the pace for a loop around the football stadium and back to the track - about 1.5 miles (It appears they no longer run this stadium loop and run a loop elsewhere). In addition a portion of the stadium loop was uphill and a portion of it was downhill so it wasn't a flat loop by any means.
We would run easy for about 200 meters to get back to the start line on the track and to group back up - and did this after and before each track portion. And I think you had to go through a gate to get on and off the track at the time so there were some obstacles to maintaining pace throughout.
Unfortunately, I never wore a watch in college so I can't report on the pace for the stadium loop but since the workout was supposed to simulate a 10k race - the 1.5 mile loop around the stadium was probably very near 10k race pace. I don't recall Ron nor Heik giving us stadium loop splits either. They would just give times for the track portions of the workout.
Then we would typically do 1200m on the track - another stadium loop - 800m on the track - another stadium loop and then a 400m finish.
The 1200 and 800m were supposed to simulate surges in the race and the last 400m was supposed to simulate the finish of the race. And sometimes we would change the order of the 1200 and 800m portions for variety.
I realize that the Michigan workout is liquid and flexible and has changed over time. This is what I recall from the late 80s and early 90s. As far as - is this a good high school workout - if you run it exactly as I described - it's basically an almost all out effort for over 6 miles so I'm not sure that this would be the most effective use of your energy in training for the 800 through 3200m races. It's probably expending way too much energy on a workout designed for a XC 10k. Mentally, it might result in a huge confidence blow when you quit early or crawl across the final finish line.
With all that being said, I would think that most high school coaches would throw in a bunch of rest after each interval and then you are talking about an entirely different workout than I recall.