If you want to restore or improve your German grammar knowledge for absolutely free, this app is 100% for you! All theory flashcards and interactive exercises are fully available.
Chapters 1 and 2 are about very important grammar topics. For example: time sentence(present, past, perfect, futur), noun, verb, pronoun, declension, adjective, preposition, adverb, article, tenses.
Chapters 3, 4, 5 consist practical exercises to check your theory skills and improve it.
Good luck and have fun in your study!