Sum

Example: 

script:sum8(\Q1,\Q2,\Q3,\Q4,\Q5,\Q6,\Q7,\Q8)

This will automatically create the sum of 8 questions

In Question "Score" we create the sum of questions Q1 to Q8 and automatically fill in the Calculated score:

You can now use the answer from "Score" for other logic.

In the example below, we automatically fill in the single response question "scoring" with answer 1 if "score" has the value 18 to 24, etc.