Also I find if I know the answer to a question i don't even bother calculating or answering it fully.
Like a question will say weak acid HOBr has concentration 0.5 M find pH
Im like gah -log(sqrt(0.5*cosntant))) saves time.
Also, writing out explanations to questions like "why can't Mg2+ make Mg in aqueous solutions when electrolyed" i just write H20 Pref red (Water preferentially reduced). When I check the exam I'll see if it corresponds to what i've said. This way you can get through exams really fast and see if you know everything. No sense writing out everything... if you need that kinda of help, well, thats for humanities.
Or for more calculation explantion thingys, like "why does nuclear fission result in more energy per gram compared to coal burning?" I'll say
related to E = mc^2
and draw up arrows to show increase in mass means HUGE ARROW UP in energy because c^2 = HUGE NUMBER