Back to school...
There is a term we call "back to school", it is a way of remembering when we were in highschool. We will put on uniforms like an highschool student, sometimes the uniforms don't fit. It does not have to be the exact school you went to, you can put on a customized uniform.
Most people have to sew something similar to a school uniform, and with their measurement because they are chubby.
The event is a celebration of highschool memories, we recount things done in highschool.
Anytime I remember my highschool days, I am happy because I have a good experience in school. I really enjoyed my highschool. But life must go on. And we must make progress in our experiences.
I share my experience with most of the highschool students I have contact with, and they actually enjoy and learn from what I share with them.

We have the same term too "back to school" but for us, it means literally going back to school, for example after the holidays or after a long break from school, you go back to school to either continue your studies or pick up where you left off. And usually, business owners would take the opportunity to promote a "back to school" sale.
On the other hand, I enjoyed my high school too, although not the exams part hehe.
The last part got me laughing.
Highschool is fun though, I am glad you can also relate.
Same with us and the term... Sales included.
I visit three different highschools through the country. I liked the exams, that years was the easiest one of all plus the exams were relaxing.
I do agree exam years are more calming and peaceful overall. Student are focused on studying or doing revisions. Less noise. It is more on the individual whether we are ready for the exam or not. If we are ready, it is calming. Haha
Back to school we also use if the summer holidays are over, or nearly over. Shops use the slogan to sell school stuff, banners are present to warn the traffic for school kids walking or bicycling.
This will last a few weeks till everything is back to normal.