You can do deep breathing exercises before the test or when you have a few minutes , you can walk across the examination room. For TOEFL test, remember to use good vocabulary, speak clearly and enunciate words well.

Do not forget to use good structure in making your sentences. Also, it will help a lot if you follow the time limit. Just relax , be confident and do your best. If you prepared well prior to the test then you will do well, no need to worry.

Good look with your exam, the most important is to be relax and enjoy the test, in the listening parte put attention in the principle parte of the speech, when you do the speaking parte be especific with your answer and the other two parts of the test are more easy I think...

All of us humans pass this exam :))

Oh it's gonna go great if you prepared which you of course did. The topics at intermediate level are more or less easy and won't create complications with general understanding. Enjoy the exam in whole, because at the reading section, for example, you'll surely learn something new. At speaking you might draw a topic that will carry you away and you develop the topic just out of sincere interest. Treat it with enjoyment and you'll succeed!

Good luck!