Here is a slide I used as revision for my secondary school students during the year. It has the main grammar rules and examples, as well as conjugations. There are 4/5 activities for the students to complete. These are German/English translation exercises, rewriting passage exercises and fill in the blank exercises. I left these slides as a free sample of the work you can expect to find on my TPT page. I am a German and Dutch linguist who teaches Germany in Ireland but also online to adults.