I only ever attended a KH 'Bible Study' once - in Cyprus, at the invitation of my JW neighbours. I was interested, in an atheist academic sort of way, and I knew that it would get them some bonus points (which they probably lost when I popped outside for a cigarette).
I was somewhat taken aback ('gobsmacked' in the vernacular) at the procedure. The guy at the front called up an old guy to read the paragraph from the magazine, which he did stumblingly (this poor old bugger lived in the same apartment complex as me and later committed suicide by drowning himself in our pool after he learned he had terminal cancer). The set questions were asked, and the set answers were given. I had independent knowledge of the bible on the subject discussed but was not allowed to speak (maybe because I was wearing jeans?). An old dear in the congregation piped up with a comment about 'blessed Pastor Russell' but she was soon hushed.
This was not a 'bible study' in any accepted sense, it was the repeated regurgitation of propaganda, and I agree with other posters' opinions that it was a mass mind-control exercise. Thinking back it reminded me very much of Hitler's Nuremburg rallies, where the crowd was encouraged to join in with 'Sieg Heil'.