Ranked by: number of candidates
1.
Vocabulary - Placement test (1624062 candidates)
2.
To be (1411944 candidates)
3.
To be (1150316 candidates)
4.
Family life (1005404 candidates)
5.
Simple present (858281 candidates)
6.
Spelled words N°1 (854342 candidates)
7.
Family (788371 candidates)
8.
Present BE + Ving (770038 candidates) 
9.
Present perfect simple (669148 candidates)
10.
List of 200 irregular verbs and audio (619694 candidates) 
11.
Spelled words N°2 (612377 candidates)
12.
Plural forms (581008 candidates)
13.
Irregular plurals (556881 candidates)
14.
Preterite (554775 candidates)
15.
Give your opinion (534817 candidates)
16.
Adverbs of Frequency (519400 candidates)
17.
Countries & nationalities (476067 candidates)
18.
Past tenses (473731 candidates) 

19.
A/an/Ø (400702 candidates) 
20.
Genitive case (370309 candidates) 
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