[{id:"1a1",package:"2ab",question:{no_soal:1,score:10},},{id:"1a1",package:"2ab",question:{no_soal:1,score:20},},{id:"1a1",package:"2ab",question:{no_soal:2,score:20},},{id:"1a1",package:"2ab",question:{no_soal:3,score:5},},{id:"1a1",package:"2ab",question:{no_soal:4,score:10},},{id:"1a1",package:"2ab",question:{no_soal:4,score:20},},{id:"1b2",package:"1ab",question:{no_soal:1,score:10},},{id:"1b2",package:"1ab",question:{no_soal:2,score:10},}]

db.collection.aggregate([{$group:{"_id":{"id":"$id","no_soal":"$question.no_soal"},"package":{"$first":"$package"},"question":{"$first":"$question"}}},{$group:{"_id":"$_id.id","package":{"$first":"$package"},"question":{"$addToSet":"$question"}}}])