Ranked by: number of candidates
1.
Comparison (225037 candidates)
2.
Present simple (157248 candidates)
3.
House and vocabulary (66588 candidates)
4.
Animals & insects (64195 candidates)
5.
Present simple (58006 candidates)
6.
Question tags (53185 candidates) 
7.
Passive voice (41680 candidates) 
8.
In the classroom - Vocabulary (41400 candidates)
9.
In the kitchen (41015 candidates)
10.
Jobs (40858 candidates)
11.
Superlative of superiority (34785 candidates)
12.
Pronunciation -ed in past simple (32722 candidates)
13.
Investigation (30030 candidates) 
14.
Means of transportation (29763 candidates)
15.
Idiomatic expressions (27898 candidates) 
16.
Sports- Vocabulary (27582 candidates)
17.
Superlative and the least (20971 candidates)
18.
Past continuous (19029 candidates)
19.
Been or Gone (17888 candidates)
20.
Idiomatic expressions (17165 candidates) 
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