Explanation for the section on "Judgement please!

Judgement section needs explaining. Ive encountered games of this kind before and have always done quite well, however Im not sure of the approach here and would a guide to what is required to score. Please add an explanation, it would be helpful.

Emmehi about みんなの脳トレ〜脳年齢がわかる脳トレ, v2.0.10