uhm read the question carefully, have a look at the outcomes of the assignment (should b on the notification) and the syllabus dot point the assignment covers. and do a lot of research. its honestly not that hard, do well in these because assignments are easy marks.
Exams you really just have to memorise a lot of information, which for some people (including me) is quite simple. Assignments, however, are where you have to go a step further in most cases.