if CFA mixes the questions from SS 13,14,10, 11 (basically most ratios, and formulas) and each question contains unnecessarily information, what are we going to do?
Skip the unnecessarily information and use the necessarily only. 
the way i do it, jump straight to the question line, then look for the relevent infos. or else i might be tangled in all the infos given and would take a me a longer time to untangle and get to the real question. exam tricks!