tests by nicks0206 with the online test builder (197 tests)
Ranked by: number of candidates
1. Pretérito indefinido: irregular (346105 candidates)
2. Verbos con diptongación (176068 candidates)
3. Soler + infinitive (156527 candidates)
4. Gustar, doler, encantar ... (155897 candidates)
5. El pretérito perfecto compuesto (136219 candidates)
6. Comparison : tan..como, tanto ..como, tanto/a/os/as..como (102654 candidates)
7. Imperfect (102288 candidates)
8. Adjectives agreement (99491 candidates)
9. Gerund (91449 candidates)
10. Present (80218 candidates)
11. Present (63502 candidates)
12. Animals (60094 candidates)
13. Conditional - SI + sequence of tenses (58995 candidates)
14. Pretérito Indefinido. Verbs in -ZAR, -CAR, -GAR (56941 candidates)
15. Colours (53559 candidates)
16. Do some shopping (49814 candidates)
17. Pretérito indefinido (46310 candidates)
18. VERBOS DE CAMBIO (45370 candidates)
19. What the weather like? (44932 candidates)
20. Pero .?.../...sino...? (43022 candidates)