Which of these courses to take if one intends to go to grad school in pure math (rank please) could you rank these classes in terms of necessity to take if I intend to pursue a Ph.D in pure math? I don't know if I can fit everything, but I want to make sure I take the most important ones:
Ordinary Differential Equations
Geometries
Applied Regression Analysis
Chaotic Dynamics
Probability
Introduction to Statistical Inference
Set Theory
Elementary Theory of Numbers
Real Analysis I
Real Analysis II
Advanced Linear Algebra
Combinatorial Theory
Fourier Series and Boundary Value Problems
Abstract Algebra I
Abstract Algebra II
Differential Geometry
Functions of a Complex Variable
Topology
Applied Analysis
Thank you in advance~~
 A: I would suggest talking to an advisor.  What areas of mathematics do you enjoy most?  That is a pretty important question you should answer first.
Usually, 


*

*Real Analysis 

*Abstract Algebra

*Functions of a Complex Variable

*Linear Algebra

*Topology


would be considered "core" courses for pure mathematics. The next ones depend moreso on your personal interests (take them all if you have time, they are interesting and useful!):


*

*Probability

*Set Theory

*Elementary Theory of Numbers

*Combinatorial Theory

*Fourier Series and Boundary Value Problems

*Differential Geometry


The following courses are more in the applied direction. 


*

*Ordinary Differential Equations

*Applied Regression Analysis

*Chaotic Dynamics

*Introduction to Statistical Inference

*Applied Analysis


Edit: I am not actually sure what area "Geometries" is referring to.
Edit 2:  After some thought, I put Topology into the first category.
A: I'd add Ordinary Differential Equations to the list. Imho it is a must for anybody who wants to become a mathematician. DE crop here there and everywhere, sort of most basic ideology in many parts of maths.  Besides to go to many other courses like Fourier Series and Boundary Value Problems, Differential Geometry and Chaotic Dynamics seems to me strange without at least some preliminary knowledge in DE.
A: This is the core you =need=, and do it in this order. 
Real Analysis I
Advanced Linear Algebra
Real Analysis II
Functions of a Complex Variable
Ordinary Differential Equations
Abstract Algebra I
Abstract Algebra II
Elementary Theory of Numbers
