I have to politely disagree with most if what you are saying here. Gcses are key to the overwhelming majority of Unis. I used to think GCSEs were irrelevant but once you have gone through the process of application you will realise just how critical they are. For example don’t even think about applying to Cardiff unless you have at least 6 though more realistically 7A*. Edinburgh 8-11A*. You can find tables out there that show the minimum GCSE requirements. But these really are the absolute MINIMUM. Just google a freedom for information request (website -whatdotheyknow) on what the average gcse grades are for any Uni and you will see for yourself.
https://www.medsci.ox.ac.uk/study/medicine/pre-clinical/statisticsJust look at the chart above. This year there were 1667 applicants for oxford medicine. Only 150 get a place. The rest of the candidates averaging around 8-10A* at gcse and all predicted A*s at A level then go onto secure places at other medical schools. That is the competition you are facing.
Once you have jumped the 1st gate of great GCSEs you then have to take either the UKCAT or BMAT. Again a really big challenge that you would be naive to not prepare for.
Predicted a level grades tend to be the easiest part of the process because they tend to be inflated whereas GCSE / BMAT/ UKCAT scores have been attained. Unis know that. The only time A level grades for medicine are taken seriously is once you have got the grades. Ie you take a gap year.
There will,of course be rare exceptions but they are that, RARE. In the same way that I am sure someone will have walked across a busy road with their eyes shut at some time, it is rare but inadvisable. You really do not want to go blind into this one. To pretend GCSEs are not a key aspect to your application is wishful thinking.
However the OPs original 6A* which whilst excellent for most degrees is below average for most medical schools, can be built on. But I would not play the “it will all work out” card. You need a killer personal statement built on genuine work experience and reading. Prep for the UKCAT or BMAT. Also if your school is from a disadvantaged area or you have extenuating circumstances then that will be taken into consideration increasing your chances. Once you have done that you have to carefully study what unis really need. Dig beneath what the minimum requirements are to find what does the average successful student get. The TSR medical application threads are very useful and worth following.
Sorry if this has been blunt. But it is correct. At least you can choose or action plan based on correct information to give yourself the best chance.
Sources: in text plus based on being a teacher for 27 years and a parent to a daughter who got the following.
Offers for medicine from UCL, Bristol, Newcastle, interviews from Cardiff and Oxford. Visits to Manchester and exeter too.