Database
[{"_id":1,"StudentId":"12345","TestId":"001","Score":2},{"_id":2,"StudentId":"45125","TestId":"002","Score":4},{"_id":3,"StudentId":"12345","TestId":"002","Score":5},{"_id":4,"StudentId":"45125","TestId":"001","Score":2}]
Query
db.collection.find({$or:[{"StudentId":"12345","TestId":"001"},{"StudentId":"45125","TestId":"001"}]})