Eligible candidates can apply for the Part 3 MRCOG online. The application period is only open for a short period of time. Any requests for special arrangements during the exam must be submitted before the closing date for applications. Refer the below link for more details

https://www.rcog.org.uk/en/careers-training/mrcog-exams/part-3-mrcog-exam/part-3-mrcog-exam-calendar/

Your entry ticket will be emailed to you approximately 4 weeks before your exam. You will need to print out your entry ticket and bring it with you to the exam, together with photographic identification.

All the information regarding the VISA shall be enquired to the relevant consulate. RCOG shall provide a letter of attendance for the exam if the candidate requested when applying the exam.

RCOG regulations state that candidates who withdraw their application for a particular exam after the closing date, or who fail to appear, shall forfeit the exam fee. RCOG cannot make changes or transfers of centers after the closing date. If you fail to attend the exam, your entry will not be counted as an attempt.
In certain prescribed circumstances, the College does consider refunding the entry fee. If you wish to apply for this, please do so in writing (hard copy, not email or fax) to the Part 3 MRCOG Secretary at the RCOG immediately after the exam you failed to attend, enclosing documentary evidence to support your circumstances.

The regulations state that candidates who withdraw their application for a particular exam after the closing date, or who fail to appear, shall forfeit the exam fee. The application forms include a reminder of this regulation. This means the College cannot refund your entry fee after an exam’s closing date and your candidature for the exam will remain. The College cannot make changes or transfers of centres after the closing date. If you fail to attend the exam, your entry will not be counted as an attempt.
In certain prescribed circumstances, the College does consider refunding the entry fee. If you wish to apply for this, please do so in writing (hard copy, not email or fax) to the Part 3 MRCOG Secretary at the RCOG at [email protected] immediately after the exam you failed to attend, enclosing documentary evidence to support your circumstances.

Candidates are permitted 4 attempts at the Part 3 MRCOG. Candidates who do not pass after 4 attempts are required to take the Part 2 MRCOG exam again.
College does require you to have attempted the Part 3 at least once within 7 years after passing the Part 2 MRCOG

No. Candidates who pass the Part 2 MRCOG written exam must attempt the Part 3 MRCOG clinical assessment within 7 years (pro rata). If they do not attempt the Part 3 MRCOG clinical assessment within this timeframe, they will be required to take the Part 2 MRCOG exam again.