Ranked by: number of candidates
1.
Comparison (220311 candidates)
2.
Present simple (150776 candidates)
3.
House and vocabulary (66478 candidates)
4.
Animals & insects (64105 candidates)
5.
Present simple (57557 candidates)
6.
Question tags (52930 candidates) 
7.
In the kitchen (40973 candidates)
8.
In the classroom - Vocabulary (40871 candidates)
9.
Jobs (40808 candidates)
10.
Passive voice (40001 candidates) 
11.
Superlative of superiority (34442 candidates)
12.
Pronunciation -ed in past simple (31942 candidates)
13.
Investigation (30014 candidates) 
14.
Means of transportation (29721 candidates)
15.
Idiomatic expressions (27849 candidates) 
16.
Sports- Vocabulary (27504 candidates)
17.
Superlative and the least (20686 candidates)
18.
Past continuous (18878 candidates)
19.
Been or Gone (17842 candidates)
20.
Idiomatic expressions (17154 candidates) 
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