Hi Dear,
We cannot predict exact percentile for your score as it differs every year. However, we can provide you an estimate figure. At a score of 50 in JEE main paper 1 you can expect a rank between 175,000 to 2,00,000 and a percentile around 78-80.
For more visit the link below:
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile#JEE-Main-Marks-Vs-Percentile-Vs-Rank-2019
Good Luck
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