Between laser hair treatments the best thing to do is either shave or trim closely. The laser needs to see a small hair present to detect hair pigmentation. While its ok to wax early between sessions you should not wax or pluck as your next session gets close. When your session is approaching it is best to have some minimal hair growth.
Do not pluck, wax or otherwise remove the hair other than shaving. Removing the hair from the follicle (such as waxing) means that the target for the laser (dark color in the hair) is no longer present in the skin. This is why waxing or plucking during laser hair removal treatments will lead to poor results.