Then you can continue with improving your maths (Linear Algebra [1], Calculus [2], [3]) and moving on with Statistical Learning [4] [5]. I am personally going now through this plan.
[0] http://shop.oreilly.com/product/0636920033400.do
[1] http://www.amazon.com/Linear-Algebra-Right-Undergraduate-Mat...
[2] http://www.amazon.com/Calculus-4th-Michael-Spivak/dp/0914098...
[3] http://www.amazon.com/Calculus-Manifolds-Approach-Classical-...