Last year the much-loved Skills Builder tool from WEF, the Water Environment Federation, received an refresh along with a commitment to keep it updated. The WEF Skills Builder offers randomized 10-question quizzes on wastewater and laboratory topics at three difficulty levels. The updates modernized the functionality as well as aligned the questions with ABC's standards for subject matter and format. The tool is free to use and correct answers are provided, along with linked references to WEF's publication store. Study guides and test preparation resources are a popular topic on our blog, including this post on studying for certification exams .