Dont they like you to have passed your A levels with a 2 year period? Would he be allowed to resit the year.
The CDE grades arent going to help you get any offers so I would look at two options.
1. Go back and retake the year ( im not sure how the two year rule affects that, any one who knows?) I would eb realistic and realise your chances of increaseing from CDE to AAA is low. Going forward with that might result in a lot of disappointment, so you should be realistic. Some people might pull it back, but not many. Very risky.
2. Do another degree and then seek to enter medicine as a graduate. Something like bio med, but it is very competitive and you will need to find additional funding.
Just be realistic on your academic ability.