I am Ranjit Shrestha just finished my course ( cookery + hospitality ( 2 years ) in 2009 dec. I got TRA certificate. I got overall 6 in ielts ( reading = 6.0, writing =5.5, speaking =6.0 , listening= 6.5 ). I am trying to apply for TR and I have heard mixed view from different consultancy .some of them say I am eligible to apply for TR while other say I cannot because for that I should get 6 in each.Do I have to get 6 in each band or overall 6?

Yes. You do need to get 6.0 in each component.