OMSB orthodontist after general dentistry?

hi! i was wondering if it's necessary to take another OMSB prometric exam after passing the one for general dentistry?  also if you have guide questions or reviewers for the general dentistry exam, it would be greatly appreciated.

thanks,
dmt

Hey everyone,
I was wondering if anyone has the study guide or material for the Orthodontic OMSB exam
Thanks

Hey,
I want to practice as an Orthodontist in Oman and I was wondering if you have any information for the OMSB orthodontics exam.
I appreciate it.