What counts as a clean pass?
A pass where every note lands within 35 milliseconds of the chart and there are no extra hits. The tempo ladder needs 3 clean passes in a row by default before it steps up, so one lucky pass does not count. You can set the number from 1 to 10.
Should I use the note highway or the notation?
Both are on screen. The notation shows the real drum part, with each note colored by how you played it. The highway shows what is coming next. Many drummers read the highway at first and lean on the notation as the section gets familiar.
What if I keep missing the same notes?
Slow down. Drop the starting tempo, shorten the section to one bar, or switch to hands only or feet only. A clean pass at 60 percent teaches more than a messy pass at full speed.