\uD83D\uDCD8 Answer
What the CPM User Guide refers to as “Composite Score” is in fact the “Total Score”, which is available on the student results export. The total score is a numerical value gathered by the parent, measure, and sub measure totals.
For example, total scores for measures will be listed as “Total Score Rapid Letter Naming” and coded “RLN_v1”; and “Total Score Rapid Vocabulary” and coded “Rapid_Vocabulary_v1”. Users can find the coding references within the Results Export Zip File titled “Reference”.
How to Export Data Using the XML File Download