Determine the level of math you wish to learn. There are many branches, some of which directly relate and some of which appear to bear little resemblance to other types of math. Generally, calculus is followed by multivariable calculus and differential equations, while linear algebra and statistics are considered their own branches.
Look for local classes. If you are enrolled in a university, classes are simple to take. Otherwise, consider a community college, online courses, or tutor.
Find helpful books and websites. The best books are generally textbooks, so browse a college bookstore or online textbook store to find a good deal on a textbook, which does not necessarily have to be new.
Set a schedule and goals. Learning higher math is useless if you never get beyond the first chapter of a textbook, so make a goal of how much you will learn and by when it will be accomplished.
Ask for help when needed. Some professors accept questions from people who are not their students, so attempt to contact someone who teaches the branch of math you are trying to learn when you need extra help understanding a topic. Also consult several resources.