Apologises to some extent - I think our definitions of 'aptitude' are at odds?!
Mental arithmetic and written tests can be 'revised' for I agree. These are more 'intelligence' tests than 'aptitude' tests (such as the military tests you take to be assessed for your 'aptitude' to train as a pilot or navigator). In RAF terms you either have or haven't got the 'aptitude' to be pilot or navigator. No amount of revising will achieve that in their terms.
Anyway, let's not get bogged down - I wasn't trying to cause a stir!!!
I have always read books to prepare for interview and it is a good way to prepare - and instill some confidence in oneself during those difficult encounters at interview!
Cheers
SITW