Get better at maths. 157 Quant signals to me that...you just aren't there yet.
Read a basic Game Theory textbook like this one by Tadelis.
You can (and should) do both of these things in conjunction.
You can move on to more advanced textbooks once you have mastered game theory basics.
> I would like to be able to work at creating my own models for certain things-particularly relating to decision making, information flows and organizational structures.
This is very vague. However, you need to start with a basic understanding of game theory.
please read a book
I guess it depends on how deep you want to study Game Theory. My university's Game Theory course (undergrad) uses Game Theory. An Introduction by Steven Tadelis.
<em>Game Theory: An Introduction</em> by Steven Tadelis.