if the 'getting relaxed' part doesn't work... dont keep struggling like I did (failed first test due to dodgy blindspot looking -stressed out- and my second one due to being totally stressed out, screwed up multiple things)
there's stuff you can ask a prescription for from your GP, which keeps your bloodpressure and sweatiness under control even when you are under stress - betablockers - These prevent the stressiness from taking hold on your driving style. I got a prescription for "propanolol" for my third test and passed with ease!!! still quite nervous but no dry tongue nor sweaty palms
PS i'm having some driving-related exams as well tomorrow and thursday!
Its for taxi driving, since a few years its mandatory to do a theory and practice test for this, much like the normal driving licence.
I also have to submit to a medical test and have to ask a document from the ministry of justice about my suitability for taxi driving

(if you have been convicted for drink&drive or violent offences theres no chance you'll get such a document

no problem for me there

)
Tomorrow its theory, thursday practice. You're expected to know quite a lot about driving time regulation, general terms and conditions, 'what would you do if...' questions, how the tariff structure works, etc so the normal traffic regulations are not so important.
the practice test also is something totally different from a driving test. the examiner pays extra attention to comfortable and economic driving (even more than on a regular driving test!!) and ofcourse how you behave as professional driver towards the 'customer' (i.e. being the instructor)
Luckily this time i'm not half as stressed out as with my first driving tests, think it has to do with already having a lot of driving experience and being almost 6 years older already...
anyway I wish us both great luck tomorrow!