Had pupils from other instructors over the years and they all come with the same idea, you have to watch the rev counter so you know when to change gear.
When it gets to whatever change into 2nd, then at  ? 3rd, they all spend more time watching the rev counter than looking where they are going.
I get student to their test as soon as possible, with just one more test to go this year they have all, apart from one,  been first time  passes  with low faults. None have been taught to use the rev counter.