hi there!
you'll have to do only one X-ray here in Doha, you do it on government premises since it is required for the permit to stay in the country but they might just use it for the company too, i really dont know..
the rest of the examinations: youll have to do everything again more or less exactly how you did it at home. and when i say the same, i mean the same eg. they make you read the thingy chart with each eye closed for the eye test. nothing is out of the ordinary