These tests are extremely valuable in that they provide a good income to the psychologists who administer them.They also help to create the impression that Human Resources are terribly clever people. To pilots they are of little use, especially when trying to select experienced aircrew.
They were originally used in the States where they gave the interviewer considerable protection if the pilot he hired subsequently turned out to be the Boston Strangler.
The correlation between the pilot that you want and the one that you hire can best be achieved, in my opinion, by sensible and relaxed interviewing by sensible and relaxed pilots.
There are however still companies which prefer the mumbo-jumbo techniques of the lego-building tests and these paper exercises. I have worked under both systems over the years and have found the good-guy to nutter ratio to be at it's optimum when candidates are selected by means of a friendly chat over coffee.
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Lou Scannon