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Your percentile is 93.57 It means 93.57% student of the Total student appeared for the Exam are Behind You Therefore 6.43% students of the Total students appeared for the exam are Ahead of You, Therefore Your calculated Approximate rank is 56228.4

 But Note that This is Not Your Final Rank Your Rank may change Because It depends on Performance of You and Others in the JEE Main April, And the final Rank would be calculated Based on comparing Final percentile ( Whichever is Higher in Both the attempts if any) of all the students

As per Your current Performance You may be eligible for JEE Advance But the final cutoff will be released once the JEE Main April gets Over

 At this rank It is Not possible to get admission into any NIT, Please try better in the next attempt of JEE Main

 You should Try to get more than 98 percentile for NIT

Hope this Helps All the Best