Hii 

You need to find rank first

The official Jee rankings will be released after the examination in April. You cod use the formula to predict your rank:

JEE Main 2019 rank (probable) = (100- NTA percentile score ) X 874469 /100

However,this rank may change as only the best of the two scores will be considered for the final rank list.

Please refer the below link

Https://engineering.careers360.com/percentile-predictor-result/1094?s=39600026441548134962

Https://engineering.careers360.com/articles/how-calculate-jee-main-2019-rank-based-on-nta-percentile-score

Https://engineering.careers360.com/articles/jee-main-cutoff

For eligibilty of the JEE adavance you need get rank below 2,28,000 rank then you will be eligible

Regards