When I work with students, they're able to get _somewhere_ after several tries, even if they're tuned out for the first 5-7 times or so.
Definitive is a relative term. It's the point at which you give up. If you give up early, that might be a good thing or a bad thing for you. It's a choice you have to make yourself.
There's also the result that at Google they found hires who had one bad score typically outperformed others; the hypothesis was that there was somebody at Google who was willing to fight for them. Having a supportive manager / peer is IMO a much greater predictor of success than passing code tests.
Definitive is a relative term. It's the point at which you give up. If you give up early, that might be a good thing or a bad thing for you. It's a choice you have to make yourself.
There's also the result that at Google they found hires who had one bad score typically outperformed others; the hypothesis was that there was somebody at Google who was willing to fight for them. Having a supportive manager / peer is IMO a much greater predictor of success than passing code tests.