We have these laminated and in the classroom for the students to refer to whilst working: (following the popular format for the French and Spanish basic mats)
includes notes on:
present tense haben and sein
perfect tense aide memoire
useful verbs in the present tense I form
How to use age in German
How to form time
Future tenses
Useful infinitives
Useful other verbs in different tenses
How to express likes and dislikes
Opinion vocabulary
A long list of useful adjectives for all occasions
Adverbs