Hey Akshat! Self attested means self verified. You have to upload a self verified that means signed by you document as a proof of genuinty. You can upload the document on the website you were using for filling up your form. You can download the document and after self attesting it you can upload to the portal. 

Dear Akshat, download the Caste Certicicate from CAT website, enter the required information and self attest it. Scan it as a PDF document and upload it.
For the convenience and many other CAT aspirants, we shall elaborate the CAT Application process:
You need to:
Register
Fill the Application form
Payment and Receipt
For registering you will need to fill in your Personal and Contact details like Name, Email Id, Mobile number and Country. Before you click on 'Agree', make sure you have entered all Correct details because you cannot go back and undo any detail on this page. Generate the OTP and you will receive it at the Mobile no# you have just given. Complete the formalities and you will be given a CAT User Id and Password . These details will be sent to your Registered Email and Mobile no#.
For filling the application form, log in using the user id and password. The application form has 5 Categories which are:
Personal Details
Academics
Work Experience
Programmes
Payment
While filling in the form, please remember that Aadhar card is not mandatory but there are clear specifications for photograph and signature file sizes to be uploaded.
Photograph: 30mm * 45mm
Signature: 80mm*35 mm
The file size in both cases should not exceed 80kb. The photograph and signature should be in .jpeg or .jpg format.
Regarding Documents like PWD/DA/OBC-NC/SC/ST: Download the CAT certificate from the website, fill in the necessary details, get it attested with authorities, self attest it and scan it as PDF and upload the same.
Under Academics section, enter the aggregate percentage, total marks, Board/University, stream, subject and degree details wherever applicable.
In regards to Selection of IIM Programmes and Cities, you can select any no.of programmes and cities. Make sure you select the same city for Interview across. And for exam centre, you can give 4 options and the authorities will select your exam city for you. You cannot select the same city more than once. Delhi and NCR Cities have been clubbed together so please remember this.
The application fees for General/OBC-NC is Rs. 1900 and its Rs. 950 for SC,ST,PWD. You can make the payment through NetBanking/Credit Card/Debit Card/Paytm and Pay U. After making the payment, you will receive a transaction number and please save it for future references. Post successful submission, you will receive a confirmation mail. And you are finally done. The last date to fill in the application form is September 18th, 2019.
For step wise instructions, transaction fees, please visit our page at:
https://bschool.careers360.com/articles/how-to-fill-cat-application-form-step-step-guide

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