No, for the online exam, you can't use scratch paper. You have to use the Pearson Vue's digital whiteboard, which is kind of clunky.
You could do a data dump on the whiteboard, but there is not much space, and it you clear it, you will lose your data dump. I only had to use it for one float question.
I recommend knowing the formulas by heart so if you need have a complicated calculation, you could write the formula on the whiteboard. I also memorized ISSCQRCRPS for the 10 Knowledge Areas in case I need to write it on the whiteboard to visually remind myself of a certain KA.
I do not like surprises, so during my mock exams, I practiced using Pearson Vue's whiteboard:
home.pearsonvue.com/onvue/whiteboard?&_g...#practice-whiteboard