I sometimes studied ahead....and then felt quite pious about it. Other times I didn't....and felt guilty. Sometimes I would study a paragraph or two ahead of the conductor during the Watchtower Study. Most of the stuff was a repeat anyway, and I remembered the points from the last time we rehashed it.
I would generally study for the Tuesday night book study, since those books were more interesting than the Watchtower. I just never could get into that magazine.