Total Sum in Configurable List

https://form.jotform.me/71491545831459

There is Subject wise Marks

in this widgets last columns is Total Marks.

Can we calculate SUM in this column?

Unfortunately it is not possible to perform calculation with dynamic widgets, like Configurable list widget.

I would suggest you to check Input Table (Matrix) field. 

How to Perform Form Calculation in the Matrix Field?

You can also perform calculation with conditional logic and with Form Calculation widget.

How to Perform Form Calculation Using a Widget 

Let us know if you need further assistance.