Argus-M is the developer of Знаток which is related to the Educational category. Over 10 users downloaded the tool and its latest update was released on Sep 5, 2016. On Google Play, this application is rated 4.6 by its users.
Get the installation package of Знаток 2.5 for free and have a look at users' reviews on Droid Informer. The app runs on Android devices 4.0.3 and above. The app is completely safe for downloading.