tests by arpeggia with the online test builder (153 tests)
Ranked by: number of candidates
1. Der - die - das (18474 candidates)
2. Adjective (11895 candidates)
3. Perfekt: 'haben' or 'sein'? (11892 candidates)
4. Modal verbs (11755 candidates)
5. Prepositions + dative or accusative case (10838 candidates)
6. Denn/weil (9866 candidates)
7. Comparisons: als/wie (8961 candidates)
8. Indirect questions (8262 candidates)
9. Times of the day (6143 candidates)
10. Seit/bis (5816 candidates)
11. Hätte or wäre? (5591 candidates)
12. Accusative or dative (5281 candidates)
13. Wer - wen - wem - wessen (4370 candidates)
14. Personal pronouns (4278 candidates)
15. Das und dass (4041 candidates)
16. Accusative / Dative (3949 candidates)
17. Verbs + prepositions (3349 candidates)
18. Als / Wenn (3267 candidates)
19. Demonstrative pronouns (3199 candidates)
20. Prepositions + accusative/dative (3166 candidates)