is it okay to write past the lines? Obviously not outside the scanning lines indicated by the corners but I mean like if they have 5 dotted lines for a short answer and I extend past this (but not past what is scanned) would that be bad? I understand that I can use extra paper or paper at the back of the exam but I don't care I just want to know about writing extra on the question.
everything is scanned, except the centre grey area that says "Do not write in this area". That's because they cut the centre of multisheet booklets to scan them more efficiently
For the 3 page writing booklets (1 a4 paper) the entire paper is scanned, even the centre, that's why the "do not write in this area" marking is not present. They scan the whole a3 sheet.
Hence you can write anywhere, except the grey area if it's present.
The black squares on the corner of the writing space is there to align the scanner, but you can write beyond them because the scanner is still capturing the whole page except the grey area