Hello,
According to your score 20 percentile in JEE mains , your rank will be under 1000000 . With this rank it is impossible to get any of the NITs or IIITs or CFTIs. Percentile indicates how many students have been outperformed by you in exam. Top 20 percentile means that you are ahead of 80% of the people. Percentile scores range from the 1st through 99th percentile, indicating the percentage of scores in the comparison group which are lower than the test taker's score. Generally the students are required to score more than 75% or above to enter to the top 20 percentile of their respective boards just to be eligible for joint entrance examination(JEE). Usually the cutoff marks for the general category students goes to 66-68%, for OBC 65-66% ,for SC 63% ,for ST 62.5% . Percentile ranks are often expressed as a number between 1 and 99, with 50 being the average. So if a student scored a percentile rank of 87, it would mean that they performed better than 87% of the other students in his norm group. There is no qualification criteria for giving JEE. For JEE you must have passed your class 12 board examination. But, to get admission into NIT/ IIT you'll have to be in the top 20 percentile of the boards.
In 2019, general category cutoff stood at 66.8%, fo 65.2% for other backward class (OBC), 63% for Scheduled Caste (SC) and 62.8% for Scheduled Tribes (ST).
So, usually for general category the percentage falls between 65-72. The official percentile data has not been declared by JOSAA yet.

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