All Creative Cloud education licenses (schools, universities, students, teachers) are offered on an annual basis only.
There is a month-to-month CC plan available, although that is for regular customers and does not receive the academic discount:
If it is only for a short time, then going with that may still be your best option if you don't wish to add via your education plan.
You misunderstood the question. I did not want buying an education license, but I wanted to buy a regular license for a student doing temporary work in my company.
I have a team license and wanted to add a new team member for a month only. That is not possible with the team panel, which is a pity, as this would add additional flexibility.
I solved the problem, by reassigning licenses of members of my team on a short term leave, to the student.
My other option was buying a license for a month, that would not be included in my team management panel. This is quite inflexible.