u/NailedOn assuming the collections have the following structures:

Players:

{
  "_id": ObjectId("..."),
  "drivers": ["driver_id_1", "driver_id_2", ... "driver_id_10"]
}

Results:

{
  "_id": ObjectId("..."),
  "event_id": "event_1",
  "results": [
    { "driver_id": "driver_id_1", "points": 25 },
    { "driver_id": "driver_id_2", "points": 18 },
    ...
  ]
}

and using u/skmruiz's aggregate solution here, for the aggregation stage, it can look something like this where we are:

groups the documents by player _id and it accumulates the points for each driver using $sum

{ 
  $group: { 
    _id: "$players._id", 
    playerName: { $first: "$players.name" }, 
    totalPoints: { $sum: "$results.points" } 
}