UK Eligibility

You can refer to the link given below-
https://studyabroad.shiksha.com/uk/universities/brunel-university/mba-healthcare-management

10-12 years of educational gap is acceptable for further studies in UK.

I can tell you for UK. GPA plays a major factor while you're applying. But if your Statement of Purpose (SOP) and Letter of Reference (LOR) academic, is strong enough then you shouldn't be worried much. Also the best part about UK is most of them are public universities, so application fee is not applicable so you should try your luck with as many universities you like.

Dear,
Applicant must be at least 18 years old. Required score in your 10+2 in Chemistry and Biology is at least 80 % (AAA grade) For international students wishing to pursue MBBS in the UK, an IELTS score of 7.0 is necessary.

For admission in the UK first of all, you have to give an entrance exam.

CGPA - 3.3/0 Applicants must have completed an undergraduate degree University accepts strong undergraduate degrees in any subject area equivalent to a UK First or 2:1 or a GPA of 3.3 and above.

The College of Medical Sciences and Dentistry offers a number of scholarships to study medicine in the UK. It is also open to all applicants who have been accepted into a British medical school. These scholarships also apply to postgraduate master's programs in medical as well as dental sciences.