Iam working as a sr.executive secretary in Oman.To get a better job it is worth to pay to any job search sites?

There is no guarantee that any job search site can actually get you a job - after all, they already have your money, so why should they bother to do any work? Even if they do try to place you with potential employers, it is still up to the employer to decide if they want you. If the answer is no, then you have wasted your money. Better that you search for a job without paying anyone for it. Most recruitment agencies get paid by the employers, not the employees. But first, make sure that you are eligible to work in other Gulf countries, that your certificates and degrees will be recognised, and that you are truly going to a better position. For this you will need to do some research on the cost of living in other countries, what the market rate would be for the job you want, and what benefits you will be entitled to legally.