Ranked by: number of candidates
1.
Pretérito indefinido (177289 candidates) 
2.
Days, months and seasons (105071 candidates)
3.
What time is it? (85192 candidates)
4.
Plural (82005 candidates)
5.
C / Z (60677 candidates)
6.
Clothes (49515 candidates)
7.
In the house (40479 candidates)
8.
Pretérito perfecto (38380 candidates)
9.
Interrogative pronouns, adverbs and adjectives (25342 candidates) 
10.
Present (regular verbs) (22368 candidates)
11.
Trades (13406 candidates)
12.
Present (12868 candidates)
13.
Plu perfect (12357 candidates)
14.
B / V (12287 candidates)
15.
Shops (12047 candidates)
16.
Telephone - vocabulary (10363 candidates) 
17.
Pretérito imperfecto (9478 candidates)
18.
Accents (9424 candidates) 
19.
LL / Y (9020 candidates)
20.
Asking questions (8761 candidates)
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