Ask HN: How to self-study mathematics from the undergrad through graduate level?
Here's my personal opinion about how you should approach this.It's all well and good to want to cover undergraduate math courses. When you are actually enrolled in a university, you will have enough inertia and motivation to complete the courses.However, when you are self-studying you are doing it all on your own. It's hard to be as thorough and cover everything.And so I ask, what really is your goal here? You don't have to learn everything about mathematics, because that is in fact impossible.My advice is to FIRST construct a bunch of projects, tasks or goals that require knowledge.It could be something like 
(a) implement a machine learning algorithm to do X from scratch
(b) implement a simple physics engine
(c) try to verify a number theory conjecture
(d) be able to solve all the exercises in a book
(e) be able to write up a compelling description/theorem/problem in math
(d) numerically solve the quantum mechanics equations of a certain systemSpend some time on material that will inspire you first to help get these goals. Numberphile on YouTube, or any of Brady Haran's videos, is a good place to start. But make the goals your own and make them personal.Math is not a spectator's sport. Make sure to DO mathematics, not just LEARN mathematics.