Frequency of GMAT questions

hi everyone,

I am starting to study for the GMAT exam. As I am not aiming for a 700+ but rather a 680 I do not want to lose time with learning some concepts that will not appear frequently considering my objective. So I would like to know what kind of questions are the more scarce for the Quand and the Verbal section

Thank you in advance for your answers,

Julien