You should look at the student's notebooks again and again.

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3. Moving around the classroom
... Continued from the previous blog.

4) You should look at the student's notebooks again and again.

If the student had failed the tasks, it would be better to write X or ✓ on their notebooks and leave from the desk immediately. In Japan, "X" means that it's not correct. "✓" means that "I surely looked at it".
Then you go around the classroom. If the student's answer was correct when you came back to the student at a second time, you can write O and should praise. If the student failed again, you write the "X" again and give a slight clue and leave from the desk immediately. And for the third time, you might write the "O".
Therefore, the point that the teacher looks at the student's notebook is always just only one.