Change into indirect speech: He says, “I worked as manager before becoming a doctor.”

The correct answer is "He says that he had worked as a manager before becoming a doctor."

The direct speech is: He says, "I worked as manager before becoming a doctor." The reporting verb "says" is in the present tense, so the tense of the reported speech does not undergo backshifting (it remains in the same time frame). However, the action "worked" happened before the action "becoming a doctor". To show this sequence of past events clearly, we use the past perfect tense ("had worked").

• "He said that he works" – incorrect because "said" changes the reporting verb, and "works" is present tense.
• "He said that he worked" – incorrect because the reporting verb should be "says" (present), and it lacks the past perfect to show the sequence.
• "He says that he had worked" – correct because "says" stays present, and "had worked" correctly indicates the earlier action.

Therefore, "He says that he had worked as a manager before becoming a doctor" is the correct indirect speech.