Hello Mohamed,
I'm Jin, a fellow Windows 10 user and an independent advisor.
If you school has affiliation with Microsoft, you may be able to get Windows under a student discount. Try contacting your faculty or I.T. department and inquire about this.
If your school has access to Microsoft Imagine, you might be able to download it for free: https://imagine.microsoft.com/en-us/catalog/web...
Another option is OnTheHub:
https://onthehub.com/download/free-software/win...
Check the link above and search for your school before making any purchase.
Kind regards.