Can I finish 1 grade in Zoucheng and then 1 grade in Jining?

I can't. According to the relevant regulations, students who have finished 1 grade in Zoucheng are not allowed to repeat the grade in principle, that is, they cannot re-enter 1 grade in Jining, and they need to go through the transfer formalities within one week after the end of the semester or before the start of the new semester. If you have difficulty contacting the school, you can apply to the local education office, which will arrange for you to attend the school.