Hi,

According to marks v/s percentile you expected percentile for 180 marks will be around 99.5 which is a really good score and you can get into many good colleges on this basis.

Also as you are aware that percentile is a comparative score and all factors are considered for calculating percentile so at this point  as the exams for this session are still going on, it is quite difficult to determine the exact percentile right now.

For more details you can refer to this link: https://engineering.careers360.com/articles/jee-main-marks-vs-percentile