Ranked by: number of candidates
1.
Pretérito Indefinido (144835 candidates) 
2.
Subjunctive present (19657 candidates) 
3.
Pronouns (19573 candidates) 

4.
Por/Para (18833 candidates)
5.
Maths (17537 candidates) 
6.
Pretérito perfecto (13932 candidates) 
7.
Future (10265 candidates) 
8.
Demonstrative pronouns (10116 candidates)
9.
Questions (8193 candidates) 
10.
Demonstrative adjectives (7720 candidates)
11.
Llegar a ser, Hacerse, Quedarse, Ponerse, Convertirse en, Vo (7263 candidates) 
12.
Adverbs (7016 candidates) 
13.
Pretérito imperfecto (6160 candidates)
14.
Sacar, Salir, Dejar (5529 candidates)
15.
Present (3306 candidates) 
16.
Idioms (2141 candidates) 
17.
False friends (1663 candidates)
18.
Numbers (1640 candidates) 
19.
Opposite words (1232 candidates) 
20.
Idioms (2 ) (587 candidates) 
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