i think you have to look at what you can improve on in your application. Did you get any feedback from the unis?
I think the most important thing at the moment is to concentrate on your exams and get good A2 grades- AAB/AAA. If you get these grades start selecting unis which suits your application. This is important, as many people apply to unis where frankly they dont stand much of a chance. SO this means look at how unis select their applicants, each uni has a diiffferent system
For example:
Sheffield- put a huge emphasis on UKCAT
Birimingham- dont apply if you have less than 8A*s
Bristol- doesnt require UKCAT, do not look at AS, look at best 8 GCSEs therefore if your GCSEs are good you should consider this uni
Leeds- requires the UKCAT, but dont put much emphasis on it, do not look at AS
Cardiff- have a point system where they add up your GCESs- if you dont have good GCSEs then dont apply
Next re-write your personal statement; it has to stand out (this doesn't mean you have to be county-lacrosse player or head-girl) it is the way you present it. Work experience is good to have but it IS NOT necessary; it is justt ensure that you have had a small insight into the medical world. I see so many people on here say they have done 6 weeks work experience in A&E or 120 hours voluntary work. Unis do not really care how much you have done, they want to see what you have learned from it.