Ujjwal, if you are asking about JEE MAINS PAPER 1, then you can predict your rank as follows. However, if your query was related to any other exam, then you can let me know in comments.

Now, To be honest, it is difficult to predict the exact ranks currently as the April session has yet to take place. However, you can predict your expected rank by this formula:-

So,(100 - your total percentile score) is the percentage of people ahead of you. Now, 869010 were 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 get increased to any number, say 1200000 then your final rank shall be (100 - your total score) X 1200000/100

In your case the rank comes out to be around 243322. It is the expected ALL INDIA RANK and not the Category rank which is quite difficult to predict at this instant.

Also, you can use this college predictor to know your chances of getting the college based on January scores