Re-taking A Level for Graduate Medicine?

All As my chemistry a-level is over 7 years old, I would need to re-take the four paper (not practical) exams to be considered for Cambridge grad entry medicine. If I retake this exam and don't do well, what is the worst case scenario? Would other graduate entry programs see this and would it reflect poorly on me? Is retaking the a-level to have a chance at Cambridge worth the potential for reducing my chances at all of the schools? I am fully confident I could do very well in the exams, but my work hours are very intense and unpredictable, and I could not guarantee full attention for the 4 exams over 4 weeks that are required. Thank you!
Source: New Media Medicine - Category: Universities & Medical Training Authors: Tags: Mature Students Source Type: forums