Is it possible to do MBBS in the UK with my current qualifications and academic percentages for a Postgraduate?

No, it is unlikely you can pursue MBBS in the UK with your current qualifications and academic percentages.

UK medical schools typically require:
- A-levels with high grades (often A*AA, including Biology and Chemistry)
- Strong 12th grade marks (usually higher than 67%)
- Relevant science background (your degree in Speech Pathology may not meet subject prerequisites)
- UCAT (University Clinical Aptitude Test) with a competitive score

You may have better options with postgraduate programs in Speech Pathology or related fields in the UK, which align more closely with your background.