Select the waste-water multiple choice practice course that you would like to work on.  There are approximately 100 question per course.  When you complete the questions, you will be presented with the Question, and multiple choices, along with the a Green check mark of the correct answer.   The total number of incorrect answers, along with the total correct answers is also given with the final report.

Practice as many times you like, till you pass.

Here’s a Sample of the Waste-water Treatment Plant Operator Test