This app is specially developed for smartphones by compiling test questions and standard answers that are conducted every year as a preparation for the national exam, ``Building Environmental Hygiene Management Engineer (Building Plumbing) Examination. This is a single-year standalone app. You can use it anytime, anywhere without worrying about communication costs, and you can check your current ability with features such as a function to determine whether the questions you have completed are correct, an automatic time measurement function for the answer, a function to display the frequency of questions, etc. It has a function that allows you to objectively understand your strengths, weaknesses, and strengths. ■It has the following functions to counter weaknesses.(1) Shuffle mode (a function that shuffles the order of questions and prevents questions from getting used to the questions)(2) Untested mode (function to extract untested questions)(3) Sparta mode (a function that extracts questions answered incorrectly three times in a row and asks them)(4) Finishing mode (a function that extracts questions answered incorrectly once or twice and asks them)(5) Calculation problem mode (function to extract and ask only calculation problems)Please use these functions to try each test question many times and improve your level so that you can reach the passing line.