leila Hi there, I've kind of been in the same sort of situation, where I grew up one of the 'gifted' kids so I put in the bare minimum effort to get good results.
I think it was year 10 when I started actively trying to study more.
Honestly my main tips would be notes, quizzes and practice SACs/exams.
Notes: Honestly notes are the most helpful thing for me in revision so it can really pay off to find note taking methods that work for you, some people might like cornell notes, some colour code (either with coloured pens or highlighters) etc, so it's all about finding the method that works best for you.
I personally number my pages in notesbooks with an index at the front, and for the notes themselves I colourcode with different pen colours (red=title/subtitle, black=key definition of the word/term in red, blue=key information, green=additional information) but that's just what works for me.
Quizzes: I honestly love quizlet/blooket, especially quizlets Q-AI feature as they can either quiz you or explain topics meaning if you get an answer wrong you can request the right answer with as much detail as you'd like. Plus for VCE a lot of the classes have had quizlets made about the topics already (e.g searching business management U3 aos1 would bring up quizlets already made with the terminology).
Practice SAC's/exams: some people like to do these consistently throughout the year, personally I like to do them a little bit before the SAC/exam as a kind of indicator on what I need to focus on (e.g. if i struggled more with one particular topic I'd know to spend more time on that in revision). Plus it's important to make sure you're familiar with the taskwords used within the study (e.g discuss/analyse) to make sure you're answering questions with the information they provided.
Also I highly reccomend checking out your study designs (you can acess them here: https://www.vcaa.vic.edu.au/curriculum/vce/vce-study-designs/Pages/vce-study-designs.aspx ) as they tell you everything that is examinable in your subjects to figure out what you need to know/study.
Finding other people in your subjects and discussing/teaching each other can also be a really helpful technique sometimes.
Hope that was some help, and if you have anymore questions I'd be happy to help as much as i can
