If the cost of extra wifi use for home-schooling is causing you concern, its possible that your school can submit a referral on your behalf to have extra data allowance added.

More information can be found here:

https://get-help-with-tech.education.gov.uk/about-increasing-mobile-data?fbclid=IwAR39kx25Majx9evYSkFvkueOzASqvLuH8i_7-uLNvGFdjXyC_j91bybNQeo