Database
[{"_id":35,"scores":[{"type":"quiz",score:1},{"type":"homework",score:2},{"type":"exam",score:3}]}]
Query
db.collection.update({"_id":35},{$inc:{"scores.$[exam].score":15,"scores.$[homework].score":10}},{arrayFilters:[{"exam.type":"exam"},{"homework.type":"homework"}]})