HSC marker's are used to seeing near illegible writing, however that being said the legibility of your writing can impact upon the ways in which the marker percieves what your actually trying to communicate, try writing slower if you must, or perhaps try a different pen. Another tip; try and slant the paper, since you are writing cursive you may be writing at an angle, so shifting the paper to a diffferent angle may make it look better. Did your school teacher comment on the legibility of your writing?