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Greetings

Your percentile is 65 It means 65% student of the Total student appeared for the Exam are Behind You Therefore 35% students of the Total students appeared for the exam are Ahead of You, Therefore Your calculated rank is 306064

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

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

As per Your current Performance Your Rank is Above 2 Lakhs therefore If You want to qualify JEE Main the You must secure a Rank under 200000 which is Possible only if You perform better in the next attempt of JEE Main, Therefore Try to score more than 85 percentile assuming at Max 14 Lakhs appear in the next attempt.

The Registration for JEE Main April will  begin By 8th February

Hope this Helps All the Best