Advanced and normal maths subjects are not basically the same in first year. There is a fairly large difference.no you dont, i dont see why u would do a subject which is basically similar to another one, in your first year that will give u the same cp at the end of the day. so y put pressure on your self in the first year, and maybe 2nd year or so, take up higher level of maths, and btw its not like u cant do it on your own.
It would be like saying why do people both with Ext 1 English, given it is similar to English (Advanced) ,(and assuming you already have 10 units without it) which you don't need, and put pressure upon yourself.
And if you're willing to do it on your own, that determination usually mean you will do well, so why not do it for credit?
At the end of the day, you want your marks to be limited by your ability, not some bureaucratic bell curve, and that's what advanced is about.