Hello

It is difficult to tell you the exact qualifying marks. However, with 84.57 percentile, you have decent chances to qualify the JEE Main exam and appear for JEE Advanced.
You have chances to appear for JEE Advanced with this percentile but chances to get admission in NITs, IIITs is less.

You should appear for the JEE Main April exam also and aim to perform better and improve your percentile. Candidates who will appear for both the session, the best of the two scores will be used to calculate the JEE Main result for them.

Also, you can use the JEE Main College Predictor tool to check your chances of admission in colleges and the engineering branches which you can get through state counselling

Good Luck!