you must be well good in english and a little bit of 
computer knowledge that's it ,... it goes well,....

to join call center's you must have good and attractive way 
of talking because customers will not see you only they 
will hear from you, with that you must be good or fluent in 
english weather you use simple english. 

you must need to develop confidence and you are rady to 
join any call center.

You must have the right attitude, communication skills, 
computer skills, knows how to handle difficult customers, 
selling the products marketed by the call center.

you must have a fluent English speech  and should be aware
of language Slang with some good Computer knowledge . sholud
be little bit talented in handling tuff costumers with their
doubts and make them satisfied with ur  way of compromise to
maketting products ............. just a matter of speech
............