It depends on what psychometrics have been used. You can ‘game’ some, specifically the ones designed to give insight on your likely behaviours, motivations, fit etc (basically the output of your personality) but you’d need to be a qualified Organisational Psychologist, probably with a PhD, to know how to do that and it would be pretty obvious what you were doing.
The ones that evaluate your cognitive ability (basically how clever you are), can’t be gamed. You’re either smart or your not. Practise also makes very little if any difference. The only variable you can eliminate by practise is nerves but that has almost no impact on your performance.
For a position like an Aldi Caretaker, they’re going to be looking for someone who is the right fit for the job. Being way over qualified (far too clever, far too outgoing, ambitious etc) is as much a problem as not being clever/good/outgoing enough.
The whole point of pyschometrics is that the increase your chances of picking the exact right person for the job, which is not the same thing as deciding if they can do the job.