Ranked by: number of candidates
1.
Pretérito Indefinido (144318 candidates) 
2.
Subjunctive present (19619 candidates) 
3.
Pronouns (19508 candidates) 

4.
Por/Para (18688 candidates)
5.
Maths (17472 candidates) 
6.
Pretérito perfecto (13862 candidates) 
7.
Future (10261 candidates) 
8.
Demonstrative pronouns (10103 candidates)
9.
Questions (8122 candidates) 
10.
Demonstrative adjectives (7699 candidates)
11.
Llegar a ser, Hacerse, Quedarse, Ponerse, Convertirse en, Vo (7251 candidates) 
12.
Adverbs (7000 candidates) 
13.
Pretérito imperfecto (6152 candidates)
14.
Sacar, Salir, Dejar (5513 candidates)
15.
Present (3303 candidates) 
16.
Idioms (2138 candidates) 
17.
False friends (1660 candidates)
18.
Numbers (1637 candidates) 
19.
Opposite words (1230 candidates) 
20.
Idioms (2 ) (587 candidates) 
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