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  You will get around 4 pages inside the question paper for your rough work in jee mains offline exam.Also there will be some space in each page for rough work.
  

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  No.You will get question paper in English language if you had chosen language of question paper as english.
  

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  You can visit jee mains FAQ Section for more details.
  

You will get enough rough sheets to do your work.

If you have choose english as your medium you will get paper only in english language.

If you want you can change your medium at the time of correction dates.

If you have choose computer based exam you will get a choice to select the language before starting your paper.

Good Luck!!