Ranked by: number of candidates
1.
Finance vocabulary (8753 candidates) 

2.
Night Sky (4420 candidates) 

3.
Trip and voyage (4037 candidates) 
4.
Social behaviour (3279 candidates) 
5.
Politics and vocabulary (2911 candidates) 
6.
War and Peace-vocabulary (2906 candidates) 
7.
Disability (2695 candidates) 

8.
Verbs followed by Ahead/ Forward (2275 candidates) 
9.
Social contestation (2179 candidates) 
10.
Medical specialities (2147 candidates) 

11.
Humour and laugh (2049 candidates) 
12.
Hospitality and catering trades (2014 candidates) 
13.
Weather and dangerous events (1927 candidates)
14.
Chance and idioms (1855 candidates) 
15.
Compassion, listening and humanity (1811 candidates)
16.
To stand and particles (1658 candidates) 
17.
Happiness and idioms (1637 candidates)
18.
Mind and words (1587 candidates) 
19.
Criminal investigation (1561 candidates) 
20.
Motherhood and pregnancy (1502 candidates)
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