Isca dought........

hi friends,

today i attented ICSA Mock test paper 

i thoughly study ISCA but

when today i attended i fill that i dont know anything 

becoz its too much creating confusion in between two answers,

or some question i know the answer but i am not sure becoz institute had change the wordings like

plan with methodology...

so please guide me now in what way should i study....

please...