The advantage (most) have with math over chess is we're given systematic instruction starting from a very young age.
So by the time you're trying to earn e.g. a 4 year degree... it only takes 4 years but you've been building up to it for over a decade by that point.
Imagine having chess class from age 5 or 6, every year, for 10+ years. By the time you're ready to "get good" at it, you'd probably already be a master
Both = hard. In fact, pretty much anything at a high level is hard.
IMHO, the hard part about math isn't learning it (i.e. taking the classes and getting a good grade), but more on its application to problems that we face everyday. I think this point was missed in the replies.