Got my test in a month, will have done about 30 hours which is around average really. My instructor gave me a mock test last week and I only got 3 minors. Just takes concentration and planning/thinking ahead. I find it a lot better if,before you go out, you think about it, how you're going to drive, the order in which you take precautions when coming to roundabouts/junctions, like what gear you're going to need etc. Does help a lot.