Hey Ram, there will certificate verfication at counselling centers declared by Board/university.You can go there and show them your marks memos and submit the declaration form.(link provided below).Take photocopies of necessary documents for proof of 10+2 marks.And intially contact the AP convener center.(As soon as possible)

THE CONVENER

AP EAMCET – 2019 Office

Ground Floor, Administrative Building

Jawaharlal Nehru Technological University Kakinada

Kakinada – 533003

East Godavari District

Andhra Pradesh

Contact Details:

0884-2340535 (O)

0884-2356255 (O)

E-Mail : 2019apeamcet@gmail.com

Website : https://sche.ap.gov.in/eamcet

https://sche.ap.gov.in/EAMCET/PDF/APEAMCET2019_DECLARATION_ENG.PDF

All the best!