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Her percentile is 54.8 It means 54.8% student of the Total student appeared for the Exam are Behind her Therefore 45.2% students of the Total students appeared for the exam are Ahead of her, Therefore her calculated rank is 395260

Her Rank would change Either her Percentile Score is Increases in the next attempt or Number of Student increases in the Next attempt the Number of Student Increases to 1400000 and her percentile remains same then her New rank would be 632800

Your rank is Not Good and You should Try in the Next attempt of JEE Main which is JEE Main April and Try to perform well

If her Percentile Score Increases in the Next attempt Then her Rank would Be calculated By the Following Formula

(100 - your total percentile score (Higher of two)) X Student appeared in JEE Main/100

Hope this Helps All the Best