To secure a rank under 3000 in JEE Advanced, the number of marks required will vary each year depending on the difficulty of the exam and the performance of other candidates. However, based on previous years' trends, here is an estimate of the marks required to achieve a rank under 3000 in JEE Advanced:

• General (Open Category): Typically, you would need to score around 40-50% of the total marks to secure a rank under 3000. In numerical terms, this could range from 150 to 180 marks out of 360, assuming the total marks remain similar to recent years.

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• OBC-NCL Category: As the cutoffs are lower for OBC candidates, scoring around 35-40% of the total marks could secure a rank under 3000. This could mean 130 to 150 marks out of 360.

These numbers are estimates, and the actual cutoffs can vary based on the specific exam year.

Best wishes for your exam.