From the Uni Edinburgh Medical School website: What You Will Study:
"Years 1 and 2
In your first two years, you will study the biomedical and clinical sciences such as anatomy, physiology, pharmacology, pathology and micro-biology, along with social and ethical aspects of clinical practice.
You will learn practical clinical skills such as resuscitation and interviewing patients, developing your clinical reasoning and decision-making skills. These skills will be advanced through workshops, community projects, GP-based teaching and student-selected components or projects on a range of topics from the clinical to the non-medical.
Year 3 (intercalated degree)
In Year 3, you’ll take on a whole new challenge, beginning an academic year of full-time, research-based study, leading to a Bachelor of Medical Sciences Honours degree. This means, upon graduation, you will receive both a MBChB and your research-based BMedSci (Hons) degree.
Known as an “intercalated” degree, the programmes on offer include biochemistry, neuroscience, pharmacology, psychology, sports science medicine, zoology and many more.
In addition to the above, for those students who are particularly interested in pursuing an academic career, with research as a significant part of their undergraduate training, there is an exciting opportunity for a small number of talented students to undertake an intercalated PhD for those interested in early training in research as well as clinical medicine. The programme is joint between Edinburgh and Glasgow. More information on this is provided below.
Years 4, 5 and 6
In Year 4, you will study all aspects of clinical medicine and healthcare. You will also develop your practical experience through placements in hospital and general practice.
In Year 5, you will explore a number of speciality areas whilst working on hospital wards as part of a team. As well as further clinical placements, you will complete an individual research project in partnership with a clinical tutor.
In your final year, you will apply your learning from previous years, with an emphasis on developing practical skills and knowledge of general and acute medicine, emergency medicine, surgery, anaesthetics and intensive care. You will have the opportunity to assist a junior doctor and, under supervision, undertake some of the duties of a Foundation Year 1 doctor."
So it looks like you can skip Year 3 and proceed straight to Years 4-6.
However, IMV you have some bigger issues to consider
Do you have the right to work in the UK after graduation? This is a big question. Places in UK medical schools for non UK citizens are limited. This is because, as I understand it, funding partly comes from the NHS for whom the new graduates will be expected to work for, and where the rest of their training will occur. They do not want to waste funding on those who cannot or will not work for the NHS once qualified. I would ask admissions about this directly.
It is hard, although not impossible, to take international medical degrees back to the US and gain the required residency experience. @WayOutWestMom will have more information on this.
I would also read ‘This is Going to Hurt’ by Adam Kay, the diary of a junior doctor in the UK.