I agree with Diane. In most cases, a bariatric program and surgeon aren't going to invest months of appointments, testing, evaluations, and preparation unless they believe you are a good candidate and have a strong likelihood of being approved for surgery. The purpose of all of those steps is to identify and address any potential concerns before moving forward.
Of course, if someone isn't following the program requirements, that could affect the outcome. But if you're doing what is being asked of you, attending your appointments, and successfully completing each step along the way, there is every reason to trust the process. Unless a significant issue comes up during the evaluations, it's helpful to remember that each completed requirement is moving you closer to your goal, not further away from it.
Try not to let fear of a possible denial overshadow the progress you're making. Focus on the steps in front of you and give yourself credit for the work you're putting in.