Your Percentile will be good in OBC category.But in general category 86 percentile score is near to expected cuttoff percentile score.You can take rough idea about rank under general quota using this formula :{100-percentile score}×874469/100,where 874469 is total number of candidates in 1st phase of jee mains exam.Right now it will be really difficult to say whether you will get NITs or not under OBC quota.Wait till April.Try to score better in 2nd phase of jee mains exam and secure seat in NITs.You can.You are close to NITs.

You can ask if you have any other queries.

GOOD LUCK!