If you failed COMP1011 or COMP1711, you must repeat COMP1011 and pass it before taking COMP1021.
If you passed COMP1011 or COMP1711 but obtained a mark less than 75% can only enrol in COMP1021 not COMP1721.
You can check your enrollment at:
https://www.student.online.unsw.edu.au/student/
Index