Khan Sir Official App Link Here :- https://play.google.com/store/apps/details?id=xyz.penpencil.khansirofficial&hl=en_IN twitter Link :- https://twitter.com/khansirpatna?s=08 Facebook Page Link :- https://www.facebook.com/khangsresearchcenter/ About Coaching:- Teacher – Khan Sir Address – Kisan Cold Storage, Sai Mandir, Musallah pur,... Read more »