tests by hidalgo with the online test builder (946 tests)

501. #el que#lo que (4884 candidates)
502. Diminutive words (4328 candidates)
503. Simple past - irregular verbs (70280 candidates)
504. Personal pronouns (1319 candidates)
505. Muy/Mucho (29175 candidates)
506. Pretérito indefinido / Conditional present (5302 candidates)
507. Synonyms (verbs) (12474 candidates)
508. Esta - está - ésta (20188 candidates)
509. Enclisis (9875 candidates)
510. Present - Irregular verbs (2640 candidates)
511. Present - Regular verbs (8641 candidates)
512. Possessive adjectives (11689 candidates)
513. Imperative no (39240 candidates)
514. Possessive adjectives (18963 candidates)
515. Missing words (1296 candidates)
516. Personal pronouns (6724 candidates)
517. Articles (16347 candidates)
518. Missing words (1155 candidates)
519. Tenses (6851 candidates)
520. Imperative (5313 candidates)