This is an educational program developed by the Confucius Institute at the University of Valencia which allows to prepare the official Chinese level test HSK from examples of examination issued by Hanban.
The app has been checked for viruses and it has been found completely secure. Sonotrigger Software is the creator of HSK-I which is included in the Educational category. On Google Play, the tool has been rated 4.4 by its users.
The most recent update was on Jan 7, 2018 and this application was downloaded and installed by over 10K users. There are adverts in the app. It's free of charge to get the .apk setup package of HSK-I and you can take a look at users' reviews on Droid Informer. This application installer requires 45 MB of free space to work fine on Android 4.0.3 and higher.
Users leave reviews pointing out that the obvious drawback of the app is a terrible user interface.