try going through a free call center training
call center academy
excel asia
---
try to write down the answers to questtion such as:
tell me about ur self?
why call center?
why our company?
what do u have that is not written in your resume?
like 3-5 sentences
then practice it , to the point ? that it seems like u already sound fluent ...
th sound , tung between teeth
ae - aepple maen
hehe
---
ive been there too , failed alot of times ...