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db.collection.aggregate([{"$facet":{"math":[{$group:{_id:"$name",maxMath:{$max:"$Math"}}},{$sort:{"maxMath":-1}},{$limit:3}],"sci":[{$group:{_id:"$name",maxSci:{$max:"$Science"}}},{$sort:{"maxSci":-1}},{$limit:3}],"Eng":[{$group:{_id:"$name",maxEng:{$max:"$English"}}},{$sort:{"maxEng":-1}},{$limit:3}]}}])