Using JavaScript to pull together 3 assessment results to give an overall score

Hi there, 

I have built 3 separate questionnaires in SL where the answers you select, tally points and at the end of the questionnaire, you are shown a results page, and then you move forward in the course. 

This SL questionnaires form part of an eLearning course that is split into different sections. 

My stakeholder has asked if it is possible to create a final results page, based on the points earned in each of the questionnaires, for 1 of 3 possible results. 

I can't seem to find a way to link the 3 separate SL files, into 1. 

I read that it could be possible to use Javascript, however, I cannot seem to get this to work either following some tutorials online. 

Does anybody have any experience with this or any pointers on how I can pull the the results from the 3 SL files into a final results page. 

Thank you for your help.