Hi Vemula,

Congrats on your AP PGECET rank. Sadly yes, you need residence certificate during the Councelling. Resident certificate of either of your parents for a 10year period is required (excluding the period the parent worked outside of AP) for other state students. 

You can refer this link for detailed information

https://www.google.com/amp/s/engineering.careers360.com/articles/ap-pgecet-counselling/amp