Zookal's app provides free questions and full solutions that have been handcrafted by some of the world's top teachers. This test prep app covers a wide variety of education levels from K-12 college/university and to licensure students undertaking postgraduate courses.
The app is totally safe to download. Zookal is the developer of Zookal Test Prep which can be found in the Educational category. The tool has been rated 3.9 on Google Play.
Over 100K users downloaded and installed this application and the latest release was on Nov 16, 2017. It's free of charge to get the installer of Zookal Test Prep, also, you can have a look at users' reviews on Droid Informer. The app works fine on Android 4.1 and above.