Just look for premise/counter premise and conclusion and then the question stem... even before looking at the answer choices...
look at each choice one by one... noting mentally or on paper.. whether this choice could be a probable choice or not.
you should be left with only 2 or 3 choices..
take a call...between these choices...
by this you will surely save on time... if you read all the choices...and don't take stalk of which one is / is not a possible answer... u spend more time...and ur judgement is also fuzzied...
practice hard, more on accuracy...and try not to repeat reading a choice...
try working in the mind... easier said than done though!