shonopono said:
I was wondering if it’s possible to do a new subject such as engineering studies next year (school didn’t offer the course). Is it necessary to complete the preliminary course to be able to do the HSC course? Where can you repeat HSC courses after school?
Would you like to do the course purely out of interest, or will you need the knowledge for the further study you wish to persue? If you're just interested in it, you could enroll in a TAFE course as suggested above, or you could always just teach yourself the course, using a text and summaries. For the latter, there are bridging courses are available, however I'm not entirely sure if engineering studies would be provided for, but it's something you could look into.
EDIT: depending on the reason as to why you want to study the course, the preliminary course may or may not be neccessary. If you wish to have it 'count' towards your HSC you will definitly have to complete the preliminary course, however even if you're studying it out of interest, it helps in almost every subject to have a basic grasp of the preliminary course as it may be needed to understand the more difficult concepts of the HSC course.