No, you need to start with a capital letter and finish with a period.
Otherwise, it's probably alright.
Aren't both as correct? Both 'would' and past simple can denote repeated actions (or actions never taken), AFAIK.***** NOT A TEACHER *****
If you are no longer in high school, and you are telling friends about your past experiences, I would prefer:
When I was a high school student, I would never ask my teachers about the format of the examinations.
I cannot explain why. If anyone agrees with me, would you please explain the grammar involved.