See if you have committed preference mistakes then in general you don't have the scope to change it during the correction process until and unless there is some special consideration regarding it and the organization offers a change.

Now if you have choose wrong city then you have to go there to give the examination. Now in general three preferences are asked, if you choose three then possibility of getting another place is also common.

Thus there are no conclusive answer it. I can recommend you to contact the orgranizing authority and get it discuss. If there is any way out they will surely guide you out.

For CTET helpline number visit the link below:

https://ctet.co.in/ctet-helpline-number/

For CTET previous year question papers visit the link below:

https://competition.careers360.com/download/ctet-sample-papers-previous-years?sort=recommended?icn=ebook-sample-papers&ici=ctet-text-mapping-news-ndtv

I hope this answer helps. All the very best for your future endeavors!