Is there any chance to increment or decrement in previous years closing ranks in josaa .If there then what it was either increment or decrement?
Every year there are fluctuation in the ranks of the JEE examinations. Now the mark distribution which are observed for most of the ranking normalizations, its expected that the competition will increase as a result the closing rank will decrease. So this kind of fluctuations are expected.
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I hope this answer helps. All the very best for your future endeavors!