It’s difficult to predict actual rank or JEE advanced qualify marks. you may calculate your expected rank by this formula

100 - your total percentile score is the percentage  of people ahead of you. 869010 are the number of candidates appeared for Jan exam. So rank formula is (100 - your total score) X 869010 /100. If the number of candidates for April exam increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100

So your expected rank is around 16, 000 as of now. But more students appear in April so your rank might be affected if more people registers .

So it is advisable you should try to get more percentile to get this rank or a better rank than this .