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[abc12345j]

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[SuperCell.27]

Your lab marks collectively form a percentage for your lab assessment component of your overall grade. For example if you're doing Chemistry for biomed, (if not, the same principle applies for other chem subjects), according to the handbook for this subject https://handbook.unimelb.edu.au/view/2016/CHEM10006, exam is 74%, lab is 20% and the 3 MSTs are worth 6% overall.

IIRC first year chem subjects require you to do 6 pracs. If the lab component of your subject grade is 20%, then each prac is worth 20/6 =  3.33% each. When you get, say, 17/20, for one prac what you actually got (as a percentage of your actual subject grade) is 17/20*20/6 = 2.83% of the 3.33%. This sounds confusing, but the bottom line is:

Each prac = 3.33% (if lab is 20% of overall grade + you do 6 pracs)
What score you get for you prac is a score representative of the 3.33%.

In order words, each prac is not worth a lot of your overall grade. As long as you routinely get above 15/20, you should be doing fine. Getting above 18 is a super job. And the thing with in-semester stuff like Labs and MSTS is that you should aim to do well in them so that you have a fallback just incase if you bomb the exam. But a lot of people cruise through in semester stuff and purposely cram for the exam to do get the bulk of the 74%. Remember H1 is getting >=80 for your OVERALL grade. So if you somehow got 0 for pracs, but 100% for everything else you could technically still get H1; but fail since 50% in pracs is a hurdle.