※ There are writings in it. It is efficient to use it together with the latest year's problem set. Analyzes the past 5 years' worth of problems and provides explanations useful for exam preparation. - Title: Pollution Control Manager National Examination Correct Answers and Hints 2022 Edition - Author: Water Quality Category, Types 1-4 - Contents: Problems and explanations from the past 5 years - Features: Fully supports exam preparation Thank you for viewing.