we cannot get a residence certificate from MRO which exceeds 3 years... then how can they demand for 7 years certificate.. how to get is there a way..

Hello,
Residence certificate is mandatory. You are supposed to submit the residence certificate for preceding 7 yrs of qualifying examination if you have completed graduation through private study without any institutionalized education. Residence Certificate of father or mother for 10 years in Telangana/A.P. excluding the period of their employment outside Telangana/A.P. from M.R.O. in the case of candidates who studied outside the state of Telangana/AP. Residence certificate from MRO for 10 years of either parent for non-locals.
Follow the link below for further information regarding your query-
https://www.tspgecet.co.in/ts-pgecet-counselling-required-documents/
Good Luck!