Not sure if this has been recommended to you, but I find it helpful to put a finger with my non-writing hand on the question number as I bubble. My only bubbling errors are due to selecting wrong answer choices. Emphasis on the 'errors'.
If you take a PT (timed, wood pencil, bubbling, all that Jazz) and score within five points of your goal score, then sure I’d take it. Otherwise, it’s really just not enough time to make it worthwhile in my opinion
... ; > Chemists invented a new technique for stripping rhodium from nuclear ... not the case here. A technique was developed to extract rhodium ... comes from using this new technique based on the argument.