Ranked by: number of candidates
1.
Vocabulary - Placement test (1622213 candidates)
2.
To be (1409584 candidates)
3.
To be (1148257 candidates)
4.
Family life (1003464 candidates)
5.
Simple present (856658 candidates)
6.
Spelled words N°1 (852490 candidates)
7.
Family (786891 candidates)
8.
Present BE + Ving (768475 candidates) 
9.
Present perfect simple (668037 candidates)
10.
List of 200 irregular verbs and audio (618637 candidates) 
11.
Spelled words N°2 (611013 candidates)
12.
Plural forms (579658 candidates)
13.
Irregular plurals (555512 candidates)
14.
Preterite (551052 candidates)
15.
Give your opinion (533632 candidates)
16.
Adverbs of Frequency (518401 candidates)
17.
Countries & nationalities (475108 candidates)
18.
Past tenses (473130 candidates) 

19.
A/an/Ø (400402 candidates) 
20.
Genitive case (369572 candidates) 
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