Tips for consistent PT scores?

Does anyone have advice for keeping your PT scores more consistent? Over the past two weeks I’ve fluctuated between 165 and 172, taking roughly 4-5 PTs a week. Today I took two PTs and scored a 166 on the first, 171 on the second, less than six hours apart from one another. I know this is probably a wack study method, but I’d appreciate any advice lol