Am i losing the perception of reality or just becoming a chill guy?

I have an examination tomorrow and i'm only done with 20% of the syllabus as of now and trust me i'm not bothered at all!
Being a Straight A's student, who used to whine about losing half mark till my 12th, my third year is a tough reversal. I used to get worked up before exams (till last sem) and study & STRESS like crazies during the preparatory leaves but this time, i'm totally unbothered. The fear is gone, i'm not sure if it's a good thing or bad.

I lowkey feel like maybe i'm losing the perception of reality, i used to be so concerned wid learning and stuff but rn i barely spare any efforts for the same. Though i also believe i shouldn't stress out for the smallest of things like a mere uni exam but idk anymore. Is it brain fog and negligence y'all!