Ranked by: number of candidates
1.
Diphthong (43165 candidates)
2.
Demonstrative adjectives and adverbs (39753 candidates)
3.
Present: irregular verbs (27963 candidates)
4.
Articles (23513 candidates)
5.
Ordinal numbers (23223 candidates)
6.
Present: irregular verbs (21865 candidates)
7.
Tenses (17667 candidates) 
8.
Present: irregular verbs (17290 candidates)
9.
Irregular verbs (14056 candidates) 

10.
Family (9675 candidates)
11.
Past tenses (9519 candidates) 
12.
Prepositions POR / PARA (4607 candidates) 
13.
ESTAR + gerund (4260 candidates)
14.
Nouns (feminine, masculine, plural) (4084 candidates)
15.
SER/ESTAR (3729 candidates)
16.
Numbers (3074 candidates)
17.
Proverbs (2294 candidates) 

18.
Ser / Estar (2283 candidates)
19.
Jobs (2244 candidates) 
20.
Comparatives (1886 candidates)
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