Dexterity for faster offroad travel speed (3% per dex point according to Pharaoh), increased bulk carrying and better chance to get a pelt when killing rabbits. Each four known moves increase Dexterity by one point to a maximum of seven (when the Test is passed).
Q: Does dexterity increase your onroad travel speed too?
A: It doesn't, that's what speed is for.
(Confirm in T3) You also get a new emote, "Demonstrate Masterful Dexterity," upon completion of this test.
Speed for faster onroad travel speed, better fishing and a chance of not losing bees when checking an apiary.
You pass the test by winning seven Speed points but you can win up to twenty one points.