Hello Riya

You can calculate your expected rank based on your percentile. You can use this formula to calculate the expected rank-

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

By this formula, you can calculate the expected rank. Nothing can be calculated exactly as of now.

Good Luck!