The student was preparing his lesson

Is "The student was preparing his lesson" correct?

It would make more sense to say the teacher was preparing the lesson. As for the grammar, it's fine.

Untaught88 said:

Is "The student was preparing his lesson" correct?

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That does depend on the context in which you wish to use these words.

What would be used for the student if he is learning the content of his lesson?

He's studying.

He's preparing for his lesson.

Untaught88 said:

What would be used for the student if he is learning the content of his lesson?

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Do you mean that he already had a lesson and now he's reviewing what he learnt?

jutfrank said:

Do you mean that he already had a lesson and now he's reviewing what he learn

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Yes. He had a lesson. Now he has to memorize it.

emsr2d2 said:

He's preparing for his lesson.

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What's the difference between "for" and without "for"?

Does using "for" mean what I want?

Untaught88 said:

What's the difference between "for" and without "for"?

Does using "for" mean what I want?

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To prepare for a lesson is to get ready/prepare for the lesson. If it is after the lesson, you say you study/revise the lesson/what you have been taught.

To prepare a lesson is to prepare to teach/give a lesson, usually done by a teacher.

It's been a long time since I was in a classroom, but the way I would prepare was show up.

Untaught88 said:

What's the difference between "for" and without "for"?

Does using "for" mean what I want?

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As was suggested in post #2, I take "He was preparing the lesson" to refer to a teacher writing a lesson plan. I added "for" to avoid that confusion. With "for", the most likely interpretation is that it's the student talking/writing.

Untaught88 said:

Yes. He had a lesson. Now he has to memorize it.

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In BrE, that's called "revising" or "revision". However, we have learnt from AmE speakers here that they don't use it that way.

Untaught88 said:

Is "The student was preparing his lesson" correct?

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As you can see from the above replies, without much more context your sentence is meaningless.