It smells a lot like a honeypot to me. It doesn't seem to have any proof that taking the exam actually converts to any benefit for real people, AND they collect TONS of data from people taking this exam.

Their privacy terms indicates they don't directly sell your data to 3rd parties. But they say that, if another company eventually acquires them, they inherit all the data and can basically update the privacy terms how they see fit and do whatever they want with it. They also admit to share your data to a lot of other companies and services in order to be able to do their 'job' whatever it might actually be, which in simple terms probably mean they share your data to commercial partners so these partners can do whatever they want with it.

So, even if they really don't (directly) sell your data, God knows what they and their partners will use it for.

It seems very clear to me, though, that they will collect all your data and will not give you anything in return but false hopes.