Hi krushna,
  First off congrats on your amazing performance in jee main. The score that you have scored is a good score and looking at past years trends, you can expect more than 98 or even 99 percentile. I am positive about 99+ but the actual percentile will depend on how other paper sections were, based on difficulty level. Also, the performance of students in both the 1st slot and 2nd slot is going to be considered so I expect some variations in percentiles this year. You have definitely performed well and now all you have to do is wait for the final results which I am sure will be good.
Also,  while preparing merit list for the NITs, they consider your academic background and percentages so merit ranking will be clear once results are out. Best of luck for your future exams.
Hope I have answered your query. If you have any further queries please comment below.

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