Just sharing...As for me, I think aside from focusing on the test center itself, which I believe is also important, we must be more focused in assessing the mistakes/lapses we've made.
From there, we can personally think of ways on how to deal with the questions in such a way that we will be able to perform better (given that we are familiar with the exam).
That's what I did. On my first exams, I know that I did not do well in writing(did not able to submit my 1st summarize text and my grammar was literally out of place!) I even did not notice the mutliple choice- mulitiple answer in both reading and listening. So those were the things I capitalized in preparation for my 2nd take. 🙂
Focus+Faith+Consistency
God bless! 🙂