I am not sure if this is the right section to ask this, but is it considered acceptable to use an asterisk (*) for something that you want to add to your answer (but there is no space) and add it on another page or as a footnote?
I am giving the SBL exam next week, but this is a general ACCA question.
I would avoid doing this if possible, as it could get confusing for the marker. Try to always leave a gap with plenty of space after your answer for each question part, so you can go back and add things afterwards if you need to.