The ratio that's important for those huge companies is the "true positive"/"false positive" one.
I guess if you make the test hard enough, always change it, and add some unhealthy dose of suspicion over the candidate's behavior, you can maximize that ratio. But I'm not confident FAANG even looks at it. It's much more likely that they just postulate that a hired employee is a competent one and go on with their day.
From the candidate point of view, of course, things are very different, and the negative results are much more important.
I guess if you make the test hard enough, always change it, and add some unhealthy dose of suspicion over the candidate's behavior, you can maximize that ratio. But I'm not confident FAANG even looks at it. It's much more likely that they just postulate that a hired employee is a competent one and go on with their day.
From the candidate point of view, of course, things are very different, and the negative results are much more important.