You are interested in OBG and have been unsuccessful after NEETPG. There would be thousands of MBBS graduates in our position as per the law of averages.
You need to focus on reading and getting a recognised post-graduation in the speciality of your choice
The CPS course from College of Physicians and surgeons, Mumbai bascially had been de-recognised in 2009 and now being recognised in 2017. The course is basically to fill the gap in the supply and demand for specialists all over the country. This is the truth.
You can opt for it and get into any of the district level or rural hospitals as this is the area of focus for the CPS holder. In real terms, it would be difficult for you to have a good practice in the major cities and town as there would be many established people with DGO and MD OBG.
While you do the CPS DGO, you can do distance education courses from IMA,for instance the fellowship in reproductive medicine (http://www.imacgpindia.com/index.php?option=com_content&view=article&layout=edit&id=145 ) and slowly build your career in rural service within the Government.
You take a senior house officer job in a reputed department of OBG in your city or state. Start preparing for the DNB entrance exams and the NEETPG for next year. While you are preparing you can get experience in OBG that would be helpful fo r the future PG course you join.
If you have age on your side and just one attempt at the PG entrance exams, and dreams of a career in a reputed teaching hospital or corporate sector, I would suggest that you consider Option:2