You don't have to do heaps of extracurricular activities for scholarships tbh
e.g. I only did St John ambulance cadets for like a few months in year 11/12 (stopped during trials/externals due to health/workload), never did ANY other extracurriculars from year 7-11 (no sport, music, etc), but it was an extracurricular commitment of 2 hours a week that was enough for me to be able to show that I have teamwork/leadership skills/take initiative etc in interviews
But keep in mind I joined cadets in the first place because it was something I genuinely enjoyed and was willing to take time out for. So yeah if you actually want to do some extracurric then choose wisely!
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As someone who was lucky enough to do well in co-ops, scholarships and cadetship applications, I've realised that as long as you are able to demonstrate both the passion and transferrable skills they're looking for, you will be fine, bc they are trying to gauge your personality from your experiences. You don't HAVE to do extracurriculars - I have friends who talked about how they show teamwork/leadership/time management/conflict resolution etc at school or home, and the interviewers loved it!! ALSO UM YEAH EVEN THOUGH I DID ALRIGHT FOR THE INTERVIEWS, MY ACADEMICS WERE QUITE LACKING SO FOCUS ON UR ACADEMICS!!!!!! NO POINT GETTING SCHOLARSHIP OFFERS IF YOU CAN'T EVEN ACHIEVE THE ATAR NEEDED YO