All the grammar tests are marked. Count correct answers in each exercise and find out the total score in each diagnostic test. The keys with answers also include the lists of grammar lessons you can do to improve your score next time.
Mixed tenses - test 1:
Mixed tenses - test 2:
Mixed tenses - test 3:
Tenses in time clauses and conditional sentences - test 4:
Tenses in the reported speech and passive voice - test 5:
Other forms - test 6:
See more pdf exercises which compare English tenses below.