tests by jagienka with the online test builder
(8 tests)
Ranked by: number of candidates
1. Declension : Definite articles (dative/accusative) (72874 candidates) 
2. Conjunctions : dass, deshalb, weil, denn (69019 candidates)
3. Negation (nicht / kein) (21200 candidates)
4. Subjunctive II (10590 candidates)
5. Perfekt (3279 candidates)
6. Additions from 0 to 10 (3232 candidates)
7. Declension : Epithet adjectives (2429 candidates)
8. Plural- nouns ending with -er (1965 candidates)
(8 tests) Ranked by: number of candidates
1.
Declension : Definite articles (dative/accusative) (72874 candidates) 2.
Conjunctions : dass, deshalb, weil, denn (69019 candidates) 3.
Negation (nicht / kein) (21200 candidates) 4.
Subjunctive II (10590 candidates) 5.
Perfekt (3279 candidates) 6.
Additions from 0 to 10 (3232 candidates) 7.
Declension : Epithet adjectives (2429 candidates) 8.
Plural- nouns ending with -er (1965 candidates) 