Official website: www.math.ucsc.edu
Ever want to know what's being offered this year so you can plan ahead? This is it. Bear in mind that nothing is set in stone until the actual registration period for the quarter begins. Though, these are usually accurate.
Also known as a BA/MA program, the rough TLDR is that you get a master's in just one extra year by starting to take graduate classes in your senior year.
This is the official source for academic information for the current year: graduation requirements, course descriptions, etc.