The subjects with the highest weightage should ideally be given priority, which are Medicine, Surgery, Pathology, OB/GY and Community Medicine. They carry the maximum marks amongst the other subjects. You can find more information in the link below:

https://medicine.careers360.com/articles/neet-pg-exam-pattern

https://medical.prepladder.com/blog/57-important-high-yield-topics-for-medical-pg-entrance-exams-prepladder.html

http://www.edumedweb.com/2017/02/pdf-high-yield-topic-list-for-neet-pg-aiims-important-topics-dnb-fmg.html

Hope this helps.

Good Luck!