Please don't take this the wrong way, but is there something you'd like help with? I don't see what you need help with in your statement above.
If it's general test-taking hints, I can say that you need to remember to breathe calmly and slowly during the exam. Hyperventilating and getting anxious or getting anxious and hyperventilating is not conducive to good test taking. The next thing I suggest is reading the question, then read the answers, and then re-read the question. Actually read the whole question as it's quite maddening to miss points on any exam simply because you skipped/missed a crucial word. You need to determine exactly what the question is asking you.
If you've never taken an CBT before, I suggest you do some online practice tests just to get used to reading/pointing/clicking.