Ranked by: number of candidates
1.
Pretérito Indefinido (144623 candidates) 
2.
Subjunctive present (19636 candidates) 
3.
Pronouns (19566 candidates) 

4.
Por/Para (18811 candidates)
5.
Maths (17529 candidates) 
6.
Pretérito perfecto (13908 candidates) 
7.
Future (10263 candidates) 
8.
Demonstrative pronouns (10110 candidates)
9.
Questions (8141 candidates) 
10.
Demonstrative adjectives (7715 candidates)
11.
Llegar a ser, Hacerse, Quedarse, Ponerse, Convertirse en, Vo (7261 candidates) 
12.
Adverbs (7012 candidates) 
13.
Pretérito imperfecto (6159 candidates)
14.
Sacar, Salir, Dejar (5523 candidates)
15.
Present (3305 candidates) 
16.
Idioms (2141 candidates) 
17.
False friends (1660 candidates)
18.
Numbers (1638 candidates) 
19.
Opposite words (1231 candidates) 
20.
Idioms (2 ) (587 candidates) 
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