It won't effect you for the HSC, however there's a possibility that it may be in year year 11 yearly exam, just because another class could have done it or something.
For biology (year 12), my teacher never did any pracs at all, however there were questions about pracs in the half yearly exam
For an 8 marker it said something like "In your class, you have -insert prac here-
One of my friends answered something like "No, we did not do this in class"
She ended up state ranking... hahaha
- one of the teachers messed up and we had to redo the exam after the holidays (although we did not know this at the time of the exam) so it didn't matter in the end