Thank you for the response. This is almost perfect and seems WAY too easy!
Is it possible to still populate the testID column with 3183 even if the score value is <NULL>? For example, personID=3 would look like this:
3 3183 Null
Since you are joining two tables where the only key seems to be person ID it does not make sense to have a person & test ID where there is no related person. But you may change your join conditions...