funny story actually. When I took my 5th kyu test, sensei was movin real quick and I was out of breath by randori as well. I got through the ukes and as we were bowing near the end (of class), I passed out. It's a funny story now, but when it happened, they called the paramedic student in the dojo to check me out. My last test was just as fast, but since the incident I've built up stamina exponentially, an dcan take the heat better. Always a good feeling after having completed a test.