is ptc sites pay us or not

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i am new on the internet and i dont know about it so much after a time come i know about ptc sites so i sing up on them and started to earning and after reaches mni amount i request for cash out,i ave requested for one month but i did not receive money.can anybody tell me which site is good not scam that pays or other easy way to earn money that can i do because i am student and new on internet