You need not tutor him anymore; he knows the ropes now.
Use idiomatic phrases like knows the ropes when talking about someone who understands the basics of a task.
no correction required
The phrase knows the ropes is an idiom that means to understand the basics of a job or task. Therefore, no correction required is the correct option. - Option (A) ties the ropes well changes the meaning and does not fit here. - Option (B) can make the ropes himself also doesn't fit the context. - Option (C) knows how to make the ropes is incorrect as it changes the idiomatic meaning. Thus, the correct answer is no correction required (Option D).