Yes, you can change your category after submitting the DSSSB exam application form. Here's how:

1. Read the official notification:
Before making any changes to your application form, carefully read the official notification released by the Delhi Subordinate Services Selection Board (DSSSB). The notification will provide you with all the necessary information regarding the application correction process and the deadline for making changes.

2. Check eligibility criteria:
Verify whether you fulfill the eligibility criteria for the new category you wish to apply for. Ensure that you meet all the required qualifications, age limit, and other criteria specified by DSSSB.

3. Visit the official website:
Go to the official website of DSSSB and log in to your account using your registration number and password. Look for the option to edit or modify your application form details. It is usually available under the "Application Correction" or "Modify Application" section.

4. Make the necessary changes:
After accessing the application correction portal, you will be able to edit the details you previously entered. Select the category field and choose the new category you want to apply for. Review all the other details and make any required modifications.

5. Upload necessary documents:
If the category change requires any additional or different documents, make sure to upload them as per the instructions provided. These documents may include educational certificates, caste certificates, experience certificates, etc. Ensure that the documents are scanned and uploaded in the specified format and size.

6. Pay the fee (if applicable):
In case there is a fee associated with changing the category, make the payment online through the provided payment gateway. Keep the transaction details as proof of payment.

7. Submit the changes:
Once you have made all the necessary modifications and uploaded the required documents, submit the changes. After submission, take a printout of the corrected application form for future reference.

Note: It is important to complete the category change process within the specified deadline mentioned in the notification. Failure to do so may result in your application being considered under the initially selected category.

Remember to regularly check the official website or notifications released by DSSSB for any updates or changes regarding the category change process. It is recommended to double-check all the information before submitting the application form to avoid any discrepancies or issues during the selection process.