Ranked by: number of candidates
1.
Comparison (223457 candidates)
2.
Present simple (154605 candidates)
3.
House and vocabulary (66580 candidates)
4.
Animals & insects (64170 candidates)
5.
Present simple (57872 candidates)
6.
Question tags (53117 candidates) 
7.
Passive voice (41344 candidates) 
8.
In the kitchen (41006 candidates)
9.
In the classroom - Vocabulary (40932 candidates)
10.
Jobs (40843 candidates)
11.
Superlative of superiority (34704 candidates)
12.
Pronunciation -ed in past simple (32535 candidates)
13.
Investigation (30025 candidates) 
14.
Means of transportation (29757 candidates)
15.
Idiomatic expressions (27895 candidates) 
16.
Sports- Vocabulary (27571 candidates)
17.
Superlative and the least (20907 candidates)
18.
Past continuous (19021 candidates)
19.
Been or Gone (17880 candidates)
20.
Idiomatic expressions (17164 candidates) 
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