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Waaaay back when I did it, you could get a couple wrong and still pass, but you had to get all of the last 6 (I think) questions correct.

9 people, 4 got 30/30, 3 failed, so probably 2 passed with less than 30/30.

It's only been 36 years since I did it, but I expect it's still the same - it's all about safe handling of firearms - keep that in mind when answering (and the 7 rules) and you will be fine.