Does Jamb Really Give 5 marks for Rough Calculations ?

Yesterday while I was discussing with a friend about the ongoing Jamb exams and how it would look like due to the fact that I have not experienced Jambs CBT before, he made me understand that during the exam everyone would be given a rough sheet to make calculations.

He also advised me to make sure I do my calculations there and also make it full because it is 5 marks.

I need to ask, how true is this ?