Hello Pankajverma and welcome to the Dubai forums
As far as I know, the following applies for obtaining a UAE driver's licence
1. GCC nationals (which includes Omanis) can either drive on their GCC licence or exchange it for a UAE license (I'm not sure which).
2. Some foreign nationals can do UAE and Dubai driving licence exchange
without the driving tests. They have to change their home country licence.
3. Anyone else has to do the driving test.