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If the examinations are coming, I want to tell my mother that I will work hard before the examinations. Which sentence is correct?

A) I will work hard in next two weeks.

B) I will be working hard in next two weeks.

C) I will have been working hard in next two weeks.

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Actually, they are all incorrect. It should be

in the next two weeks.

Now on to your actual question about tenses.

C) is incorrect. It uses future perfect tense, which is usually used in a context like this

By January, I will have lived here for 3 years.

You could say something like

When the test date comes, I will have studied hard for two weeks.

A) and B) are both correct, and they mean basically the same thing. Here's a link that explains the difference better than I could: https://english.stackexchange.com/questions/28234/will-be-doing-vs-will-do

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