Your percentile score is the percentage of people ahead of you. Percentile scores indicates the percentage of candidates that have scored equal to or below that particular percentile in that examination and this is generally from a scale of 100 to 0 for each session of examinees.
The percentile depends on various factors like Number of candidates appeared in the examination, highest marks obtained etc. So this keeps changing every year. So if we look back, then as per this year's Jee Main Marks vs percentile data, 99.6 percentile score would be around 185 to 190 out of 300.
Check out this link for detailed information on Percentile http://engineering.careers360.com/articles/jee-main-marks-vs-percentile

Dear Aspirant ,

In my point of view the cutoffs would increase a bit (If not a lot) so here is my prediction about marks vs percentile

These are predictions and may vary

100 percentile - 290+

99+ percentile - 185+

98+ percentile - 150+

97+ percentile - 140+

96+ percentile - 125+

95+ percentile - 112+

94+ percentile - 100+

93+ percentile - 95+

92+ percentile - 90+

91+ percentile - 85+

90+ percentile -78+

85+ percentile -60+

80+ percentile - 50+

For more information check the link given below :

Hope this information helps you,

Thank you

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