tests by chocolatcitron with the online test builder (203 tests)
Ranked by: number of candidates
1. School stuff (174892 candidates)
2. At school: teaching equipment (18056 candidates)
3. British English - American English: residence 3/3 (13345 candidates)
4. For-since-ago (9619 candidates)
5. Preposition: "to" or "no to" - 1/3 (8347 candidates)
6. Active - passive (8120 candidates)
7. Indefinite articles: a - an (8049 candidates)
8. Possessive case (7411 candidates)
9. At - in - on (6941 candidates)
10. False friends: nouns - B (6734 candidates)
11. Self-service shop (6280 candidates)
12. British English - American English:clothes and accessories 1 (5505 candidates)
13. British English - American English: residence 2/3 (5154 candidates)
14. Fire and jobs (4895 candidates)
15. Playground: children's games (4327 candidates)
16. Irregular plurals (4034 candidates)
17. Hours : timing (3752 candidates)
18. At the hairdresser's : haircuts (3698 candidates)
19. Passive - active (3683 candidates)
20. Interrogative pronouns - WH (3555 candidates)