Only one of the answers within all of the FRQs is graded for sig figs. In the past, there was a +1/-1 leeway, but that is no longer the case. In general, the point has been on a lab question, but there is no guarantee that will continue. I recommend holding students to using correct sig figs as much as possible, realizing that on the exam, they will only be one point out of 46. "If the Ka answer is given as 6.80 x 10-4, instead of 6.81 x 10-4, will that still get a point?" Most likely yes. We are not worried about slight differences in final answers caused by rounding (at the end vs. at every step, or when looking up molar masses). We care more about the chemistry - is the calculation set up correctly? In fact, a "correct" answer earns no points without work shown.