REvit Software over Autocad

salam ive got selected in a company as a design engineer,so i still have time as the visa has not arrived yet..my question is are people in saudi udsing Revit software or Autocad? for the design...i am an H.V.A.C design Engineer.so i still have a month left to go...so should i learn revit? or autocad is enough? actually i got a job through my relative in dammam...so plz do help me as soon as possible

For hvac Auto cad and microstation (microstation if working with saudi aramco projects)

so no one uses revit in saudi?

As i know non of the company in Saudi using Revit only micro sattion and Cad