hello dear

If CAT application form is submitted once , after that if you want to correct few details , you can do it again in the official website , but only  you will be able to edit the following fields - photograph, signature , test city preferences

And you cant edit more programs  in the form

if you want to do so then you have to register with a different email id and start to fill the new application  again and submit

hope its helpful

any queries drop down in the comment box

good luck.