Kudos to you, Inti. You're an amazing student for always being prepared even with surprise exams.
impromptu tests occur sometimes when teachers get angry as a punishment or teachers want to understand the situation of our study.
This sounds like a lot my teacher way back in high school, lol!
Studying was my strength all the time and for that reason, I was always sincere about my study. And the output of it is good for me.
!PIZZA
That is great :) Keep it up and all the best!