I feel abnormally relaxed

I've noticed that in situations that are *supposedly* stressful i'm abnormally calm. Like GSCEs which the exams are next year. I know i should be worried but for some reason my mind thinks: "Well, at the rate i'm learning now i should pass" and i've seen so many people doubt it. I'm just always taking it easy. Even in a situation where i'm supposed to do something quickly i think slow and steady wins the race. This prompted me to never revise on anything my entire life amd i got surprisingly good grades for it. I'm curious, is that normal?