e.title,f.uid as userId,f.examId,f.examPaperId,f.score,f.trueScore,f.maxScoreTime,f.lastTime,f.areaId,
f.howMuch,f.avgScore,f.bigQuesScore
, case when f.score >= 85 then 'A'
when f.score >=80 then 'B'
when f.score >=70 then 'C'
when f.score >=60 then 'D'
else 'E' end as level