Hello Aspirant,

See as of now the result declaration pattern has been changed so it is little bit difficult to predict that what percentile you are going to get on any of the particular marks.

However percentile depends on the number of students scored less than or equal to you so as you have asked if you did not attempt 30 questions but you have not mentioned that how much questions you will do correct and how much incorrect so it is quite difficult to predict the percentile.

You can get an idea of percentile Vs marks from the link given below :-

https://engineering.careers360.com/articles/jee-main-marks-vs-percentile

I hope this information helps you.

Good Luck!!