You can withdraw your application form in case if you find any discrepancy in it, or in case that you do not want to carry forward with the registration process.
In order to withdraw the UPSC IAS application form, you can follow the steps I have mentioned here.
First, you should go to the official website of UPSC. Then hover over to the section called “What’s new”. Then go to the “Withdrawal of Application link for Civil Services (Preliminary) Examination” of the year of concern. After that you should follow the instructions and then click on withdraw.
Next, click on the Application withdrawal link located on the right corner of the page once again. After that, read all the instructions carefully and then click on the Yes button given there. Next, fill in details like your Registration ID and press the enter.
Then you’d have to enter your details such as your name, Date of birth, Gender, Father’s and mother’s names, mobile number, and email ID. Then press on the Withdrawal of application form button for the particular year and press agree after that.