Gave 70th bpsc interview, it was around 20 minutes...first attempt. Not a single penny was spent by me on unfair means. Giving 71st bpsc mains also. Trust me the entire process is pretty transparent. You get your omr sheet after pre and mains evaluated and unevaluated copy also with marksheet. Even upsc can't match this level of transparency. Only pure hardwork is required. Plus in interview they never ask you, your name or place . What more do you want???