Ranked by: number of candidates
1.
Placement test (beginners) (704491 candidates)
2.
How to talk about the weather (321052 candidates) 
3.
Past perfect (292862 candidates) 
4.
Wishes (208188 candidates) 
5.
Direct and indirect speech (202884 candidates) 
6.
Comparatives of superiority (200719 candidates)
7.
Adverbs of frequency (188430 candidates)
8.
Will / Be going to (171343 candidates) 
9.
As / like (163977 candidates) 
10.
Article The and geography (148106 candidates) 
11.
Possession (144572 candidates) 
12.
Exclamatory sentences (135889 candidates) 
13.
Auxiliary do (126273 candidates)
14.
Must / Have to (121809 candidates) 
15.
Have or Have got (119148 candidates) 
16.
Express the future (114469 candidates) 
17.
Both, the two, neither, none, all (114027 candidates) 
18.
Can , could , be able to (111722 candidates) 
19.
Action or non action verbs (111340 candidates) 
20.
Irregular verbs (111201 candidates)
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