I will simple put in one or 2 points that might improve your startegy that i picked during my intense sessions with Cr
don't pick options that feels right during the initial reading try to find a flaw in this if not then move on either chose this or look for other optons '
whenever youre given some kind of information that was never quoted in the passage however it seems quite logical unless it's a weaken or strengthen question avoid it
at last when youre down to last 2 options chose the one that doesn't state the sentences in the passage exactly that's never experience
practise bb's ditectory extensively and evaluvate with experts answers like Gmat ninja versatis and you will eventually improve in the end never give up you will be better at it i will assure you i carried out the same just check outmy weekly CR rating
HOPE IT HELPS