tests by jagienka with the online test builder
(8 tests)
Ranked by: number of candidates
1. Declension : Definite articles (dative/accusative) (73505 candidates) 
2. Conjunctions : dass, deshalb, weil, denn (69135 candidates)
3. Negation (nicht / kein) (21249 candidates)
4. Subjunctive II (10597 candidates)
5. Perfekt (3284 candidates)
6. Additions from 0 to 10 (3238 candidates)
7. Declension : Epithet adjectives (2433 candidates)
8. Plural- nouns ending with -er (1970 candidates)
(8 tests) Ranked by: number of candidates
1.
Declension : Definite articles (dative/accusative) (73505 candidates) 2.
Conjunctions : dass, deshalb, weil, denn (69135 candidates) 3.
Negation (nicht / kein) (21249 candidates) 4.
Subjunctive II (10597 candidates) 5.
Perfekt (3284 candidates) 6.
Additions from 0 to 10 (3238 candidates) 7.
Declension : Epithet adjectives (2433 candidates) 8.
Plural- nouns ending with -er (1970 candidates) 