Hello there,

Yes, the person can still get admission in an IIT if they meet the JEE Advanced eligibility criteria and score well enough in the exam.

Key points:

1. Intermediate (Class 12) passing status: Clearing Maths 1B in advanced supplementary means they passed the subject, so the academic eligibility is met.
   
   

2. JEE Advanced marks: Scoring 400+ in JEE Advanced is a good score and can help secure admission depending on the branch and category.
   
   

3. Other eligibility criteria: The candidate must also satisfy age limit, number of attempts, and other rules set by IITs.

So, if all criteria are met and the rank is good, admission to an IIT is possible despite the initial failure in Maths 1B.

I hope this answer helps you. If you have more queries, feel free to share your questions with us, and we will be happy to assist you.

Thank you, and I wish you all the best in your bright future.