M.S

Many UK universities came up with programs for which you are not required to take PLAB. Cost of pursuing Masters in UK ranges from 15-25 Lacs/year.

You have to decide yourself which course to choose. All I can help you is to provide course details of various medical PG programmes,
For details about streams, visit https://goo.gl/GmQEj2

No, if you pursue your medical from UK, USA, Canada, Australia and New Zealand you are not required to take any screening in India. All PG qualification are eligible for registration and practice in India. Visit MCI link: https://goo.gl/5SK1ml

UK has an option to study PG MD/MS without any entrance examination. Only IELTS is mandatory requirement. As per Govt of India Gazette:
http://www.mciindia.org/tools/announcement/Recognition out side India.pdf
all post graduate qualification is UK are accepted in India
for more details https://goo.gl/GmQEj2

You may get advantage in admission process over freshers who are without experience for pursuing Master degree in Germany.
All the best.

No, you can not apply for IIITs with GRE score for MS in pharmacy.

No, you can not. MS course is done in the subject of your Bachelor's degree course.