Cenvat set off on Education cess

Can any body answer my queries.

1) Is it possible to set off education cess on central excise with education on service tax. is it necessay that the assessee should be registered under both the acts.

2) Is is possible to take cenvat credit on labour bill without mentioning any bifurcations.

3) is it necessary to hold serice tax bills to claim Cenvat Credit on serice tax or is it enough just make payment to service.