Do I need to register for ace as soon as I begin my ALEKS course or I can wait?

[IrishJohn]

Also I think I once read you should take the math classes in order, maybe someone can back me up, but the order of classes matter as well!

It doesn't matter as far as getting credit for the ALEKS courses, but it's usually smarter to go in a certain order. Depending upon your degree, as well as the school you are attending, I'd recommend the following order:

Int. Algebra, College Algebra, Trigonometry, Precalc and Intro to Statistics.

Remember that not all of these courses may be needed or count for credit where you wish in your degree plan depending upon your major and school.