Just my personal opinion of course, but the Thomsonfly numerical tests are way out of date, whereas the BA ones appear to have moved on with the times. I agree that as a 'de-selection' level they're probably good, but a bit of updating wouldn't go amiss. I never use a calculator in the flightdeck out of personal choice to keep the brain working, but quadratic & simultaneous equations? at my age? - jeez!