Office 365 Education for Students is available for free to students who are enrolled at qualifying schools. Install Office on up to 5 PCs or Macs and on other mobile devices, including Android, iPad®, and Windows tablets.
Schools can check the eligibility by visiting office portal, entering and validating the email address.
After successful validation, school should sign up and get access to software's and license's.
Even teacher's can visit same portal link below and check the eligibility.