Hello Aspirant,

See it is quite difficult to tell you an exact figure of your marks because it keeps on changing every year depending upon various factors but yes we can help you with approximate figures on the basis of analysis of previous year's data.

So If we go through the analysis of marks Vs Percentile for JEE-Main 2021 then according to the percentile mentioned by you in the question your marks are

>>>>>>>> expected to be under 30 out of 300 .

And the percentile is the same as your NTA score is because NTA score is commonly known as percentile.

Note that the marks range which is predicted is only the expected range on the basis of previous year's data so your actual percentile  Vs marks might vary depending upon current factors.

To have a list of all those colleges which you can get based upon your JEE-Main score or rank you can use JEE-Main College Predictor:-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!