Build quiz with multiple scores from sections containing opinion scores

Hi there, I’m new to Typeform, so apologies in advance if daft question! I’ve seen this post that has got me close to what I need, but I haven’t got the logic right… https://www.typeform.com/help/a/build-a-quiz-with-multiple-scores-4410816726804/ 

My quiz is thus:  I have 8 question groups, each containing 6 opinion scale questions that score from 0 to 5 each. 

I’d like an ending page to have a score for each section example scoring like this:

Group question 1 = 5/30

Group question 2 = 20/30

Group question 3 = 15/30

etc

I have created the 8 variables for each group. 

In ‘quiz and scoring’ I have added in scores relating to their opinion scale (from 0 to 5) e.g. if select 3 they score 3, 0 if select 0

In ‘branching and calculations’ I haven’t got the logic right as instead of adding up for each section, the rule is “always add score to Group x’ - which of course just keeps on adding up so I get this result:

Group 1 = 15/30

Group 2 = 180/30

Oops! 

How do I select just the ‘score’ from that question group, not the entire quiz?

If possible I don’t want to have to add each opinion scale response as a rule in the ‘branching and calculations’ like in the above ‘multiple scores’ link - how can I use the already set up scores in ‘quiz and scoring logic’ to total up just that section? 

Hope that all makes sense?! TIA :)