Hi,
I myself is an UPSC aspirant and have to appear for it in June 2019, so i can say i can be good source of GK and also of other subjects for Prelims. My source of knowledge are The Hindu , Insights or Vision monthly magazines for GK/GS, and for regular subjects NCERTs (6-12), Mrunal lectures, G.C Leong, Plassey to Partition, Laxmikanth etc. So let me know if I suit for this role and can have a discussion.