It is difficult to predict the actual rank or qualifying marks as first time JEE is being conducted twice and rank will be based on NTA percentile score but you may calculate  your expected rank by given below Formula.

874469 are the number of candidates appeared for the January exam. So rank formula is (100- your total score) * 874469 / 100.

If the number of candidates for April exam increased to 1400000 then your final rank shall be (100- your total score) * 1400000/100

You can also check your admission possibility with the given below JEE Main college predictor.

https://engineering.careers360.com/jee-main-college-predictor

Good Luck!