What is some tools that a Math graduate student must have to be competent in a Machine Learning Master? • /r/MachineLearning

I have studied Mathematics and got my degree and I am very interested in applying for a Master in Machine Learning. Of course my math background is high enough I believe. We did some coding like C, R, Matlab and worked SPSS. I've taken the Stamford Machine Learning coursera course and got a very very small taste of Machine Learning, so I guess what are other things I have to study to have a complete arsenal of tools. Thank you for your time.