Should I read the passage first then answer or answer immediately in IELTS Reading Section ?

in reading section in IELTS best way to answer quickly , do I read the whole passage first then answer or answer immediately because u got only 20 minutes and the passage is huge and I always read the passage first then answer but sometimes when I look for the answer I read the whole passage again which is a waste... show more in reading section in IELTS best way to answer quickly , do I read the whole passage first then answer or answer immediately because u got only 20 minutes and the passage is huge and I always read the passage first then answer but sometimes when I look for the answer I read the whole passage again which is a waste of time so what do you recommend ?
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