It's seriously not that hard. I did Maths in Society (I think its the equivalent to General Maths now) back in 1998 for my HSC. I got a high distinction in stats last semester and that's after getting a 10% penalty in the mid semester for not colouring in my student number on the m/c answer sheet. I got 100% in my finance mid semester this semester, so if you apply yourself you will do really well.
Don't listen to people like Sathius, he posts rubbish on here all the time - he even went on to say he was going to spend 10 years finishing his bachelors but I think he pulled out.
But anyway, all these fancy greek alphabet letter and symbols look confusing but they teach you this in class what it all stands for - it really is simply just plugging numbers into the formulas. They also have U-Pass sessions if you require them, which are weekly classes run outside the normal tutes and lectures run by volunteer students who have done really well in the subjects you are doing.
But also, do what I did - youtube or khan academy something you don't know - having an Indian female lecturer last semester in stats made learning difficult to understand with the language barrier but the internet will teach you everything in video if you look for it.
Good luck.