Hey as per my idea Texas State Board of Dental Examiners offer RDA Exam Online and here I am giving you its details

Eligibility
Candidate must Successfully pass a hands-on practical examination performed on a typodont.
Candidate must Successfully pass a State computerized written examination.
Candidate must Successfully pass a State computerized law and ethics written examination

Documents required
Copy of your Online Application and Online Payment Summary receipt.
Copy of your RDA Course Completion Document.
Proof of current Basic Life Support (BLS) cardiopulmonary resuscitation (CPR) certification.
Copy of your driver's license, naturalization papers, or passport.
Copy of your DANB Card (if you hold this card).

Syllabus
Module I: Jurisprudence
Purpose of the Texas Dental Practice Act
State Board Rules
Purpose and structure of the State Board of Dental Examiners
Provisions for licensure
Regulations for Dental Auxiliaries
Professional Conduct
Minimum Standard of Care
Module Exam

Module II: Infection Control
CDC Infection Control Guidelines
Infection Control Rules of the Texas State Board of Dental Examiners
Hand hygiene
Alcohol based hand rubs
Sterilization techniques
Sterilization vs. disinfection
Spore testing
Instrument processing
Instrument wrapping
Surface disinfection
Medical waste
Dental unit waterline disinfection
Module Exam

Module III: Radiology
Radiographic principles and theory
Normal Anatomy
Technique and processing error recognition for intraoral and panoramic radiographs
Radiation biology
Protection
Risk assessment
Aseptic techniques for dental radiology
Quality assurance principles and procedures
Module Exam

Address
Texas State Board of Dental Examiners
William P. Hobby Building
333 Guadalupe Street
Tower 3, Suite 800
Austin, TX 78701