My 2A and 2 both took me two attempts.
Because in both classes, 1st attempt, I rode slow and easy, no
immediate failures but and got 30+ points.
Second attempt rode with a little more rev, passed with 8 and 10
points, respectively, 4 for plank, and 4 for bumpy, and Class 2 got
2 points for delay in moving off.
For Classes 2A and 2, you are no longer treated as a novice, you
are considered an experienced rider and must show it.
Its easy, but not too easy, guard against complacency.
Circuit revision is actually self practice. The instructor will
tell you some rules to observe, then to take a bike and practice,
and should you have any questions, to ask him or any other
instructors. He will then dissappear. One or two practice just
before test date is sufficient.