Question

Why is it helpful to make mental notes during a formal discussion?

Answer 1

to make connections when it is time to speak

Step-by-step explanation:

sorry I know this is a little late but I hope it helps! :)

Answer 2

During formal discussion, mental notes could help you maintain your focus/attention for the point that given by another speaker so you could give your opinion or counter argument later.
This will give the impression that you're an attentive and a competent person.