Hello Harshitha,
I guess you can change your exam center and address in KCET 2019. Try it once.
Steps for doing so:

• Click on the official website link.
• Click on the “Edit CET-2019 Application” link.
• A new page will be opened on the screen.
• Now, enter your User ID and click on “Send OTP” button.
• OTP will be sent to the entered mobile number.
• After submitting the generated OTO, changes will be done.
• Now, make corrections in wrong details.
• Verify and ensure that all the changes did are correct.
• After modifying details, click on the “Declare Button”.
• Take the printout of the modified application form for further use.

I hope this helps.

All the best !!