UF TREEO Review and Exam Prep Courses prepare students trying to pass the State of Florida Water and Wastewater Operator Exams. These courses will not qualify you to apply to FDEP for your water or wastewater license. Exam prep Classes are three to five days of intense exam review and preparation. For more information on how to become a Certified Water/Wastewater Operator in Florida, please refer to Helpful Hints to Certification.