I had my first 3 VCE exams in the span of 2 days. Stressing out really wasn't an option for me, so I prioritized staying calm above last minute cramming despite my illness prior to examination week (of course, I went overboard with that to the point of complacency, which you don't want; there is a fine balance between urgency and indifference).
Ultimately, dealing with pressure effectively is a matter of mentality, and the way you approach it will vary with the individual. Few good things to note, though:
1. Panicking is a waste of energy and detrimental to your performance.
2. It does not matter if you fail. It does not matter if you fail. It does not matter if you fail.