Ranked by: number of candidates
1.
Comparison (221977 candidates)
2.
Present simple (152280 candidates)
3.
House and vocabulary (66496 candidates)
4.
Animals & insects (64127 candidates)
5.
Present simple (57616 candidates)
6.
Question tags (52986 candidates) 
7.
In the kitchen (40985 candidates)
8.
In the classroom - Vocabulary (40891 candidates)
9.
Jobs (40816 candidates)
10.
Passive voice (40799 candidates) 
11.
Superlative of superiority (34529 candidates)
12.
Pronunciation -ed in past simple (32177 candidates)
13.
Investigation (30016 candidates) 
14.
Means of transportation (29735 candidates)
15.
Idiomatic expressions (27860 candidates) 
16.
Sports- Vocabulary (27524 candidates)
17.
Superlative and the least (20784 candidates)
18.
Past continuous (18987 candidates)
19.
Been or Gone (17851 candidates)
20.
Idiomatic expressions (17158 candidates) 
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