Ranked by: number of candidates
1.
Subjunctive present (1562473 candidates) 
2.
Placement test : grammar (1363569 candidates) 
3.
Date (159005 candidates)
4.
Poner los verbos entre paréntesis en los tiempos indicados. (135210 candidates)
5.
Demonstrative adjectives (134891 candidates)
6.
Imperative: -ar (127525 candidates) 
7.
Pronombres personales complementos de objeto directo e indir (126358 candidates) 
8.
Imperative (107901 candidates) 
9.
Conjugation (92707 candidates) 
10.
Imperative: regular verbs (68211 candidates) 
11.
Syllables (66830 candidates)
12.
Antonyms (57769 candidates) 
13.
Pluperfect (55676 candidates) 

14.
Comparison (47509 candidates)
15.
Describe our house (41413 candidates)
16.
Está/Esta/Ésta (38767 candidates)
17.
Article LO (31797 candidates)
18.
Pretérito perfecto (31704 candidates) 
19.
Prepositions (29798 candidates) 
20.
Pretérito indefinido (29426 candidates)
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