Hello GodfreyChang,

If you are talking about preparing some kinds of exams,
you'd better read its official notebooks.
The more the better.

If you are talking about improving your ability of enjoying movies,
you'd better watch TV shows or original movies directly.
The longer the better.

English simply is a tool,
no secret,
practice produces perfection.

Let me know what's your opinion.
Thanks.

thanks，

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