NRF artic shores is an insanely interesting test.
Most "G" loaded test I have had to take for a law firm for sure. Seems as though they are largely testing for IQ, or at least providing very g loaded psychometric testing - basically largely reaction speed and working memory. I see why they would use it; I agree it is almost impossible to prepare for.
Was some weird tasks , one of which seemed to basically be some sort of "game theory task" where you had to price items with the knowledge of how much profit you/ the other team would get if you went high/low. I am unsure as to whether this was a test for teamworking ability or some proxy for intelligence.
The final task seemed to test "perseverance" as well as reaction speed. It was untimed and you could have as many goes as you wanted in order to reach the final level.