Hei @Cedric CARRERE ,
Thank you for reaching out to Microsoft Q and A.
I understand that you want to use Azure for students and as long as your students have an email with the institution they can do it.
When they signup, they will need to use their institute's email address.
After they signup, they will get a credit of $200 to be used for the next 12 months, individually.
Azure for Students gets you started with $100 in Azure credits to be used within the first 12 months, plus select free services as described below (services subject to change) without requiring a credit card at sign-up.
This is for individual students and the institute may not need to manage it.
Read about the offer in more details here
Common questions about the offer here
In more advanced use, it is possible for education institutes to use 'Azure Education Hub' to manage the credits and provision it too.
Get started with 'Azure Education Hub', invite your students and manage how much you want to spend centrally as an institute.
The Microsoft Azure Education Hub is a tool that helps academic users provision and manage cloud credit across many different Azure subscriptions. This is useful when faculty members need to manage many cloud-based student projects. The Education Hub is also useful for research purposes when your Azure credit needs are not yet known.
More details on how, here
Create assignments and allocate credit like mentioned here
Please mark it as answer if it helped