sleep apnea test

Hi! Having a sleep device mailed to my home for a sleep study test. Due to my BMI being short of 40 I have to do this and/or gain a few pounds (which I've been trying to do). Not sure how I can "ace" this teat so to speak so that I can proceed ahead with my journe . Any ideas, tips, suggestions???? I need this for ins purposses as I am not the ideal weight for surgery