2W2R
I'm not sure it Thread drift, with the greatest respect!
An airline is short of pilots, VERY short some say - so what happens (it seems) is that HR are 'allowed' to filter out prime contenders for what some might consider non-aviation reasons.
There might arguably, be a link between maths proficiency and sim performance - not brain surgery really. Like saying there is a link between doctors and IQ level!!!
Flying is a science-based pursuit to a greater degree, so just as HR might find there is a link between maths and sim performance they might also find a link between maths and musical ability?! (well known). After all the pilots in Airplane were able to fly on 'instruments' lol
Seriously, it will always be a bone of contention whatever you do - some might say that a recommendation is no better than a maths test, others would say far better.
I just wonder how many 'good eggs' have been rejected and how many are left to fill the slots which will come available?
Supply and demand wont be satisfied by passing or failing the online tests.