Hey aspirant!

The NTA score which you see in your results is the actual percentile that you have secured in January JEE MAIN attempt. Do not misunderstand it to be your cumulative marks, the total NTA score is the percentile that you have achieved ie the percentage of people you are ahead of. As regarding to your query about rank, to be honest, it is difficult to predict the ranks currently as the April session has yet to take place and the actual rank will be calculated by taking into consideration your best of two JEE attempts. However, you can predict your expected rank based on January scores 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 increased to 1200000 then your final rank shall be (100 - your total score) X 1200000/100

In your case the rank comes out to be around 363854. Note that this is the GENERAL or ALL INDIA RANK and not the category rank.

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