Hey Pragati.

You can use this Rank Formula to get an estimate of what your rank will be around    (100 - your total score) X 874469 /100. Here 874469 are the number of candidates that appeared for JEE mains 2019 January attempt.

Hence considering your percentile and using it along with the formula, you can estimate that your rank will be around the range of 55,700 This is  only an estimate. It might differ also because the final rank will ne computed on considering the performance in both January as well as April Session.

So in case you wish to improve your rank or give it another shot you can register for the April session too. The registrations will begin in February. The best of the two scores from the April and January session will be considered to compute your final rank, hence it will be beneficial.

Best of luck!