Yes, you can apply for the IBPS PO Exam even if you have made a mistake in the application form.

Here's a step-by-step process to rectify the mistake:

1. Identify the mistake: The first step is to identify the mistake you have made in the application form. It could be an error in personal details, educational qualifications, or any other relevant information.

2. Contact the authorities: Once you have identified the mistake, you need to contact the authorities responsible for conducting the IBPS PO Exam. This could be done through email or phone. Make sure to provide your correct contact details so that they can get back to you.

3. Explain the mistake: In your communication with the authorities, clearly mention the mistake you have made in the application form. Be honest and provide all the necessary details related to the mistake.

4. Provide supporting documents: Along with explaining the mistake, you may be required to provide supporting documents as evidence to rectify the error. For example, if there is an error in your educational qualifications, you may need to submit scanned copies of your certificates or mark sheets.

5. Follow the instructions given: The authorities will guide you on how to rectify the mistake in the application form. They may ask you to submit a revised application form or provide the corrected information through email.

6. Submit the revised application: If the authorities ask you to submit a revised application form, make sure to fill it accurately and double-check all the details before submitting it again. Pay attention to the deadlines provided by the authorities to ensure timely submission.

7. Keep a record: It is important to keep a record of all your communications with the authorities regarding the mistake in the application form. This will help you in case of any further queries or clarifications.

Note: It is always advisable to double-check all the information before submitting the application form to avoid any mistakes. However, if you have made a mistake, it is not the end of the world. By following the above steps, you can rectify the mistake and proceed with the IBPS PO Exam application process.