How can I score the practice test if the score range is given?

The score range is given like 640-720 or 450-520 in each section.
I tried to find it on YouTube and everywhere but no one explains how to score in that case.
Which number should I take and calculate for the score?
Please help me…

Take the average of each range. That will give you a number close enough to what you might get.

you mean the middle number of the range? like if there is 10-20, should I take 15?

Yes.