Hello,
When you are filling in the Yangchengtong student card application form,
if you are currently in grade 6. Then go to the primary school to get the stamp stamped.
If you are currently in the first grade of junior high school, go to your junior high school to get the stamp stamped.
In fact, you can fill in the sixth grade or the first year of junior high school. It depends on which school you go to to get a stamp, so just fill it out.
I hope this helps, thank you.