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Hi at 66 marks in jee mains it will be around 84 to 91 percentile if we see the trend in 2021 marks vs percentile in jee mains but this year it may change as it depends on highest marks scored and no. of students appeared in your slot
you can use percentile predictor of career 360
JEE Main Rank Predictor - Know your expected IIT JEE Main 2022 Rank by ...
also here is previous year marks vs percentile
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile
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