Which test series and coaching material is good for the UPSC prelims and Mains? General Studies-IV (GS-IV), also known as Ethics Integrity and Aptitude was introduced by UPSC in 2013. Since then, the complexity of this paper has been increasing manifolds. Ethics test series for UPSC If you lose momentum, everything is finished. Thanks to the dynamic nature of the subject, it is becoming difficult year by year to score well in Ethics.