Okay, the personal statement is all about why your want to get the master of taxation degree/why study taxation, and your career goal. I wrote it myself, and ask my friend to help with the grammar and the overall flow.
You can find the exact topic on MTax's website.
Work experience, MTax admitted both fresh undergrads and undergrads with working experience.
GPA, I have an 83% GPA, but with 4 years accounting related working experience, but I assume you need higher GPA if you are a fresh undergad with no accounting working experience.