tests by nicks0206 with the online test builder (197 tests)
Ranked by: number of candidates
1. Pretérito indefinido: irregular (341359 candidates)
2. Verbos con diptongación (174303 candidates)
3. Soler + infinitive (155441 candidates)
4. Gustar, doler, encantar ... (154874 candidates)
5. El pretérito perfecto compuesto (135629 candidates)
6. Comparison : tan..como, tanto ..como, tanto/a/os/as..como (102253 candidates)
7. Imperfect (101645 candidates)
8. Adjectives agreement (98993 candidates)
9. Gerund (90738 candidates)
10. Present (79855 candidates)
11. Present (63152 candidates)
12. Animals (59721 candidates)
13. Conditional - SI + sequence of tenses (58713 candidates)
14. Pretérito Indefinido. Verbs in -ZAR, -CAR, -GAR (56308 candidates)
15. Colours (53320 candidates)
16. Do some shopping (49644 candidates)
17. Pretérito indefinido (46066 candidates)
18. VERBOS DE CAMBIO (45074 candidates)
19. What the weather like? (44582 candidates)
20. Pero .?.../...sino...? (42630 candidates)