Ooh, don't think I've ever had a proper look at Section B before. Hold on....
<Pause while FFF reads Section B>
Ah - I see what you mean! Yes, that's very confusing, isn't it.
Seems to me, having read the section you're talking about now, that Section B is wrong, and that the bit you quote should refer to the PPL exams being passed within an 18 month period. Otherwise, it wouldn't make sense in the context of Section C. I wonder if someone like BEagle could shed any more light on it? Otherwise, maybe one for the CAA to answer?
FFF
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