Hello

hope you are doing well and safe. With reference to your query,  I would glad inform you that it is very difficult to predict the exact percentile for your marks but yess for 90 percentile score should be above 200 , so according to your marks your percentile will be around 85-88 as per recent years data. For your reference , follow the below link:-

https://bschool.careers360.com/articles/nmat-score-vs-percentile-analysis

Hope you found this answer informative. Best wishes for your future