Hello @Dalia Adel ,
please be advised that if you don’t pass the beta exam, you must wait until the exam goes live to retake it. Kindly wait until it goes live to be able to schedule a new appointment for the exam MD-102. For reference and additional information, you may visit the page below: https://learn.microsoft.com/en-us/credentials/certifications/beta-exams
Additionally, you have the option to describe your problem in the Microsoft Certification Forum using the link below. Support moderators are available there to respond to your request within a few business days.
Link: https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
If this is helpful, please accept the answer. Thank you.