Mvat set off on works contract opting for composition scheme

Dear sir

There is works contract bill i received for carpentry,civil,modular furniture and electrical/networking work done in office where he charged MVAT @ 8% as well as service tax @ 4.12% so,whether we can get the set off under MVAT for full amount if not then please clarify and whether we have to deduct the TDS.The contractor is opting for composition scheme.