Hello Madhumitha,

As you have already mentioned that you have a diploma degree in  Gynaecology and Obstetrics, and now further you want to have a masters degree.

But i'd also mention here that the NEET PG forms were out for 2018 exam, on 31st october itself. again, you have almost lost chnace this year as per me. and as mentioned in the eligibility criteria, you must have an years work experince.

Refer to the link 

Https://medicine.careers360.com/articles/neet-pg-eligibility-criteria

For more info on eligibility and the exam for masters.

And if you are talking about JIPMER, there too you need to have a work experince of minimum 1 year.

Follow the link

Https://medicine.careers360.com/articles/jipmer-pg-eligibility-criteria

All the best