Hello Durgesh,
According to the guidelines provided by NTA,you can appear for JEE Mains 2021 but you will not be eligible to give the JEE Advanced 2021 even if you qualify JEE Mains the next year.If you qualify the JEE Mains exam next year you can get  admission in NITs.
About you not being prepared till now,don't lose hope there still are 2 and a half weeks.Don't go for new chapters,you've been studying this syllabus since the past 3 years,revise the chapters you are strong in.Aim for  a score of 150 or 180, then make a strategy,don't cover the whole syllabus,solve and observe the previous year question papers and analyse from which chapters,more than one question comes.
Don't take any pressure and also don't waste much time in leisure activities.Think about your goal in these 2 and a half weeks.I'm sure you'll achieve it.

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