<p>You cannot gain admittance into a graduate program without an undergraduate degree.</p>
<p>I have some suggestions, though. Return to your university, and find out what you can do to test out of as many math courses as possible. Then take upper level and graduate level courses as an undergraduate. Supplement math courses with those from other disciplines to give yourself a more well-rounded education. </p>
<p>Just because you got a near perfect score on the math subject test, it doesn’t mean that you have been trained as a mathematician. Courses – seminars, in particular – will teach you how to research and how to approach problems from novel angles. The exchange of ideas in class is often as important as the actual course content. </p>
<p>You’ll also want to engage in some kind of independent study and research. You’ll need that to get into graduate school. Your solid knowledge of mathematical topics will go a long way here toward forging a special relationship with a prof, who will likely enjoy mentoring you.</p>