My friend made application for android and iOS "reality check", you can download application on App and Play store. Application is free and it has various positions from mostly grandmasters practice.
You are starting from 600 ELO and your ELO will change according from your performance.
With that application you can improve your practical strength in random positions.
Please share your comments to help us improve.
For more information go to
http://realitycheck.academy/