I Joined Dr. Ravi Agrahari's Classes for GS-III PAPER module, Its really excellent work by this professor. he is really best in this part. I am non science student, i got all discussion and compilation best with comparison to other institute. best part of his class discussion, he start his class from basics and then come at the end of current updation and model answer discussions with every chapter. Here i just share my opinion for this module. Its complete solution for prelims and mains exam. you should try once for this class.