Ranked by: number of candidates
1.
Simple future tense - will or going to (9086 candidates) 

2.
Present perfect (6294 candidates)
3.
Comparative or Superlative (5871 candidates) 
4.
Present simple (5839 candidates)
5.
Simple future tense (5130 candidates)
6.
Plural of Nouns 1 (5071 candidates)
7.
Stative or dynamic verbs (3469 candidates)
8.
First Conditional (2985 candidates)
9.
Adjectives order (2803 candidates)
10.
Past perfect (1867 candidates) 
11.
Personal protective Equipment (1805 candidates) 
12.
Past continuous (1805 candidates)
13.
Conditional Sentences (Zero conditional) (1717 candidates)
14.
Vocabulary-bank (1693 candidates) 

15.
Reported speech (1683 candidates) 
16.
Future continuous (1583 candidates) 
17.
Phrasal verb - Get (1530 candidates) 
18.
Vocabulary and banks (1372 candidates) 

19.
Fruits (1245 candidates)
20.
Countable or uncountable nouns (1230 candidates)
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