first,you need 1 paper resume and two references, that is necessary, they do not call you if you don't have this, They never watch resume,when you see the employer, he will ask you experience and math skill, only 5 minutes,I try to ask more questions about them, How was the payment, what is daily target? How long the training? Important thing 150 call in one day, you must let costumers pay 50k today(employer said it is "very easy") Training time is "1 day" if you can, ok,after we do reference check, we let you know. I don't know how long they make decision, but from my opinion,they really think which kind person can be match, or keep call people interview but no one staying.