きのうの模試のお昼の風景。
At lunch break yesterday.
新聞テストや公立入試では、
昼ごはんの後に数学の試験がある。
In ShimbunTest and pulic highschool entrance exams, the math test is always right after lunch break.
眠くならないか、練習だ。
That's why, it's been a good practice for them not to get sleepy.