Practising German grammar: a workbook for use with Hammer's German grammar and usage - 2nd ed.
Martin Durrell, Katrin Kohl and Gudrun Loftus (1996)
Focus is on the written language and the exercises concentrate on key grammatical structures covering all aspects of German grammar.
The chapters are set out in parallel to the chapters in the grammar book, and each exercise has a reference to the appropriate section.
Workbook for those with a good basic command of the German language.
GE GRAM 7a Open access