Good Day ESMA,
My name is Carlo, I am also using Windows 10 pc and community member like you.
You can still have it after graduation, if you have the Windows 10 license key you need keep it.
Here's a similar threads.
https://answers.microsoft.com/en-us/windows/for...
https://answers.microsoft.com/en-us/windows/for...
I hope the information above helps.
Have a wonderful day ahead and stay safe.
Sincerely,
Carlo T.