Submitting an application for an exam like JEE Main twice, even by mistake, can lead to complications. The exam conducting authorities, such as the National Testing Agency (NTA), have strict rules against multiple applications from the same candidate for a single session of the examination. Their primary concern is to maintain the fairness and integrity of the entire process for all applicants.

It is highly unlikely that the authorities will directly ask you to "pay net" for the duplicate submission. Instead, their standard procedure, as outlined in their official guidelines, is to reject all multiple applications . This means that if they identify that you have submitted the application form more than once for the same session, all of your applications are likely to be cancelled. You will not be issued an admit card for the exam, and you will not be able to appear for it.

The system is designed to prevent candidates from gaining any unfair advantage through multiple submissions. Therefore, they typically do not provide an option to pay an additional fee to rectify this situation.

It's also improbable that they would wait until after the exam to cross-verify and then ban you. The process of identifying duplicate applications usually happens before the admit cards are issued. Sophisticated software and verification processes are employed to detect such instances based on details like name, date of birth, address, and other identifying information. If your applications are flagged as duplicates, you will likely be informed about the rejection before the exam date.

The best course of action if you realize you have submitted the application twice is to immediately contact the exam conducting authorities . Reach out to them through the official helpline numbers or email addresses provided on their website. Explain your situation clearly and honestly. While there is no guarantee of a resolution, informing them proactively about the error might lead to some guidance or a possible, though unlikely, solution. However, be prepared for the possibility that all your applications will be rejected as per the rules. It's crucial to be very careful while filling out and submitting application forms in the future to avoid such issues.