tests by sidou77 with the online test builder
(7 tests)
Ranked by: number of candidates
1. Reflexive pronouns (10887 candidates) 
2. Conjunctions : dass / ob (9101 candidates)
3. Subjunctive I (7425 candidates)
4. Als, wenn et wann (5142 candidates)
5. Prepositions : auf, an, in, über... (3904 candidates)
6. Prepositions (3191 candidates)
7. Prepositions (2603 candidates)
(7 tests) Ranked by: number of candidates
1.
Reflexive pronouns (10887 candidates) 2.
Conjunctions : dass / ob (9101 candidates) 3.
Subjunctive I (7425 candidates) 4.
Als, wenn et wann (5142 candidates) 5.
Prepositions : auf, an, in, über... (3904 candidates) 6.
Prepositions (3191 candidates) 7.
Prepositions (2603 candidates) 