AP Statistics

I am doing a Masters of Business Analytics in Australia. 

In addition, I am going thru the Math and Statistics course on the Kahn Academy. I am considering formalizing that knowledge by taking the AP exam.

Is there any value in taking that exam, considering that I am already enrolled to a masters degree? 

Are there any other exams/certifications which could have a positive impact to my future career in Australia?

Is getting a certification the best way to demonstrate my knowledge and interest for statistics and probability?