The National Theatre has some really useful education packs from productions past as well as present – though they’re not very easy to find on the website. The section you need is in the ‘Discover’ section, where you should follow the link to Resource Packs; the Past productions section, in particular, has a long list. Of course Stagework, also from the National Theatre, is excellent and more interactive, but these pages on the main NT site have materials from A Midsummer Night’s Dream to Hamlet and Translations.
Free resources on National Theatre productions
Really useful education packs from National Theatre productions