U,ll get the marks of .5. But u have to mention the name of ISA too in full, as ISA number is too easy to remember and its not an achievement until u remember its name. I did my acca in June and i read the examiner article in which she said .5 marks will be given only with full name of ISA otherwise mentioning only for e.g. ISA 220 will not give u any mark until u provide its full name in the exam like ISA 570 going concern. Students are unaware of this fact, even the teachers.