What is Review mode under SCORM/AICC module settings?
Once a user has completed the SCORM Module and the completion requirements are met, the default action would be to "Review" the course instead of starting a "new attempt".
Review mode allows a allows a learner to review the completed SCORM/AICC modules without resetting the previous results or the completion progress. Retaking the module in review mode will retain the Learner’s prior scores and interaction data from their last attempt.
"Start over" will reset the Completion results and a new attempt will start, making it will mandatory for learner to complete the module once again.