Extending answer by @thebernardlim further,
If you have multiple choice columns with the choices like: 1,2,3,4,5 and you want to get the overall score (your question title mentions it) based on these columns values (SUM), you can use formula like below for your calculated column:
=CONCATENATE([Choice1]*30 + [Choice2]*30 + [Choice3]*30," points")
Sometimes, you may need to explicitly convert number choice options to actual number value using VALUE()
function like:
=CONCATENATE(VALUE([Choice1])*30 + VALUE([Choice2])*30 + VALUE([Choice3])*30," points")
Column Settings:

Output:

Note:
- Sometimes comma(
,
) does not work in formula (it is based on language or regional settings on your site). So in that case use semicolon(;
) instead of comma(,
).
- Use correct display name of your SharePoint columns in above formula.
- Wrap column names inside
[]
if your column name has space in it. For example: [Choice Column 5]
Official Documentations:
- Calculated Field Formulas