19M currently a pressured fresher

Hello all I have been in a tone of mental pressure for weeks now due to this hell a Frick re neet by nta now with the amount of days left and the amount of preparation i did with the burn out its something that's scares me, 3rd may exam was ok for a first attempt bio chem went good and phy 12th portion also but now I have seem to forget everything and now I am burned out no more fuel is left in me all I want to ask is

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1. Is a drop common or needed in my age

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2. What are the problems a dropper faces that makes him waste his year

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3. What it takes to get selected and what are the things to be done

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4. Why is it that most do not get selected i hear they study a lot still

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Thank you all for reading this i know you all are also really tired and not well rested enough but still we all are here discussing for the better good