tests by hidalgo with the online test builder
(7 tests)
Ranked by: number of candidates
1. Active voice and passive voice (8123 candidates) 
2. Declension (2583 candidates)
3. Conjunctions (2282 candidates)
4. Prepositions : von, über, auf, an... (1782 candidates)
5. Definite articles (1480 candidates)
6. Idioms (1355 candidates)
7. Prepositions (1190 candidates)
(7 tests) Ranked by: number of candidates
1.
Active voice and passive voice (8123 candidates) 2.
Declension (2583 candidates) 3.
Conjunctions (2282 candidates) 4.
Prepositions : von, über, auf, an... (1782 candidates) 5.
Definite articles (1480 candidates) 6.
Idioms (1355 candidates) 7.
Prepositions (1190 candidates) 