= Organized contents =
Air environment article: 2001-2022
Water Quality Engineer: 2011-2022
Water Quality and Environment Industry Article: 2018-2020
Environmental Technician: 2011-2016

= Problem notes, incorrect answer notes, test mode, and study mode are supported.

[Essential access rights]
- Save: Stores information on problems solved by the user within the app, and stores comprehensive problem-solving information such as personal information related to the problem, such as ‘favorites, incorrect answer notes’ and scores.
- WIFI connection information: Detects Internet connection status and uses it to send advertisements.
- In-app payment: Used to remove ads or use other services if necessary while using the app.