Math1015 is definitely easier. Anyone would be able to do it especially given that you only did general maths. I assume you have never done integral calculus before? If so then math1013 would not be for you as calculus especially integral is a major component of the unit
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I suggest you do both biol1003 and biol1001. I'm applying for usyd dent as well next year and I've only done biol1903. They may change the biology prerequisites any year so it's safer to do both. Plus if you wanna do anat2009 you'll need two biol units anyway. As for mblg1001 I strongly suggest...