Becoming successful requires a stubborn conviction that you can make your own ideas a reality. Doing well on tests requires the ability to re-enact the ideas of others.
They're both valuable skills of course, but they should be recognized as being distinct from each other; and measuring "intelligence" as some one-dimensional modality is a spectacular failure to do so, IMO.
This idea is also to an extent analogous to the tradeoff between exploration and exploitation in reinforcement learning (AI).