1. My first question is, is it bad to do all three sciences?
No, it is definitely not bad to do all three Sciences, if you're capable and strong in Year 10 Science (above 90%), I'm definite you can handle Science. However, the workload, especially coming from Biology will be very heavy. Likewise, Chemistry and Physics are very challenging since they are one of the difficult subjects in senior school.
If you're motivated and know you will not get tired from the workload, the constant needing to study, the constant report writing for practicals and can keep up with learning content, go for it.
2. My second question is should I do business studies or economics? I did very well in commerce in Year 10 but I'm unsure of whether I should do business studies or economics.
I say this to every little junior student I see. I feel like,
AND I KNOW that Commerce is not a very good or clear indicator of whether you will be good in either Business Studies or Economics. Rather, I feel like its a little closer to Legal Studies, but yet again, its merely a dab on the tongue in terms of tasting
HSIE IN GENERAL. I believe, having taken Commerce when I was in Year 9 and 10, whilst doing Accelerated Business Studies in Year 9 and 10, was very different.
Commerce will be a clear indicator of whether you are interested in Social Sciences. Not if you're good at them. And thats the honest and blunt truth I tell everyone who feels because they are good at Commerce, they will be good at senior subjects.
By far, Economics is the hardest and more challenging subject in comparison to Business Studies and Legal Studies.
I don't quite remember Year 11 Business, seeing I did that 2 years ago, but I am doing Preliminary Economics right now.
The difference between Business is that, although both subjects are very content heavy and essay reliant, Economics is much more demanding in terms of the quality of your essay writing. Whilst Business Studies is more of a breeze and more of a relaxing subject, it requires less basic maths and formulas (which is covered in HSC Finance) than Economics. Another difference I found is that, Business Studies is very focused on what happens within the four sectors of a business (Operations - AKA manufacturing, Marketing, Finance and Human Resources) whilst Economics studies the Economy itself and involves lots of statistics.
Personally, seeing your subjects (your 3 Sciences), adding Economics will be another giant workload because it demands a student to constantly revise workbook questions and practise essays. And if you don't apply that practise in Year 11 and not invest time into cultivating those skills, Economics will be a difficult path and possibly a burden in Year 12, which is what you don't want. In conjunction with your 3 Sciences, Business will be a more relaxing subject, because whilst it does require lots of work, its concepts are much easier to memorise and learn than Economics.
eco scales higher than business, not that scaling should be ur main discriminant (doesnt hurt to take it into account tho
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No subject will scale well if you don't perform well in them. Its not worth taking into account if you have absolutely no skill in the intricate essay writing of Economics.