For each unit you complete of each subject on your course, you'll get a certain amount of credits, which will eventually add up to 60 credits. If you complete an assignment that is worth 3 credits and you get a distinction, that will be 3 credits at distinction, and so on with every other assignment, and these are graded by your teachers
It's achievable if you put the work in, in my college we have the healthcare course and social sciences course, and it's very rare that people get grades lower than a merit after the first unit or two.
If you have good teachers and you're willing ro put in the study time, you can smash it