Calculations on jotform - Can we give each question a weight?

Score calculating function - can we give each question a weighting depending on each answer and then generate a score at the bottom of the report? This would obviously be hidden & for admin purposes only.

Yes, you can do that.

You can - as mentioned by yourself, use it to form simple and/or complex calculations as well as to pass values such as emails, etc.

You can see more on that here:

How to Assign Calculation Value

How to perform calculation in the form?