Ranked by: number of candidates
1.
Vocabulary - Placement test (1620348 candidates)
2.
To be (1407442 candidates)
3.
To be (1146536 candidates)
4.
Family life (1001841 candidates)
5.
Simple present (854996 candidates)
6.
Spelled words N°1 (851059 candidates)
7.
Family (785561 candidates)
8.
Present BE + Ving (766418 candidates) 
9.
Present perfect simple (663371 candidates)
10.
List of 200 irregular verbs and audio (617007 candidates) 
11.
Spelled words N°2 (609881 candidates)
12.
Plural forms (578284 candidates)
13.
Irregular plurals (554354 candidates)
14.
Preterite (549733 candidates)
15.
Give your opinion (532620 candidates)
16.
Adverbs of Frequency (517491 candidates)
17.
Countries & nationalities (474069 candidates)
18.
Past tenses (471763 candidates) 

19.
A/an/Ø (399419 candidates) 
20.
Genitive case (368676 candidates) 
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