Ranked by: number of candidates
1.
Diphthong (42971 candidates)
2.
Demonstrative adjectives and adverbs (39636 candidates)
3.
Present: irregular verbs (27769 candidates)
4.
Articles (23462 candidates)
5.
Ordinal numbers (23139 candidates)
6.
Present: irregular verbs (21744 candidates)
7.
Tenses (17570 candidates) 
8.
Present: irregular verbs (17133 candidates)
9.
Irregular verbs (13997 candidates) 

10.
Family (9670 candidates)
11.
Past tenses (9451 candidates) 
12.
Prepositions POR / PARA (4600 candidates) 
13.
ESTAR + gerund (4231 candidates)
14.
Nouns (feminine, masculine, plural) (4077 candidates)
15.
SER/ESTAR (3725 candidates)
16.
Numbers (3069 candidates)
17.
Proverbs (2294 candidates) 

18.
Ser / Estar (2281 candidates)
19.
Jobs (2237 candidates) 
20.
Comparatives (1869 candidates)
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