Very bizzarre recruitment process. Not good, not bad, just bizzarre. If you have many hours to dedicate towards it (and very good logical and numerical skills) definitely go for it and challenge yourself, otherwise do not even try to apply.
If they like your cover letter and your CV, they ask you to complete a series of quizzes (mostly logical and numerical, other basic comprehension, other very typical HR questions). This will take an average of 7 hours and you have a week or two to complete it. The problems are the same for every position, I reckon. To be completely honest at first I thought they sent me the wrong ones: I applied for an internship (recruiter) and I could not understand why they were so keen to know my numerical and logical skills (I have got a humanities background for a reason hey!).
If you do 'a good job' they call you (1hour) and ask you very typical HR questions. They then compare your results (tests + interview) with the batch of candidates they have in the pipeline. In my case, I did 'very well' in every aspect of the process apart from the numerical and data problems - they even suggested that I would make a good recruiter (or at least I was told this)- , so they decided not to proceed with the other steps.
FYI: the other steps would have been, another series of logical test, another HR style interview and another interview where you have to solve a problem live in front of them.
Now, I completely understand that they need some sort of a benchmark to standardize the candidates, but being tested on something that you would not use in your daily job (a very repetitive job made of screening and calling, screening and calling, by the way, with very little space for lateral thinking) is just bizzarre. Test me on my organization and research skills, give me a batch of candidates to screen, think about other practical tests, but please, taylor the process according to the role!
I agree that such a process would definitely work for some more technical positions, but not for a recruiter role!