I avoided A and B for that reason 
My point is that the student needs to learn the material at some point.
We normally know that having a 7,8,9 in chemistry GCSE is an indicator that the student knows the GCSE chemistry syllabus pretty well. Therefore the student can take courses or do work that assumes this knowledge. The next level is designed with this in mind. Any brushing up on the topic will be brushing up not teaching anew.
In 2020 we have broken that expectation. Having a 7,8,9 in chemistry is not an indicator of the student knowing the syllabus pretty well. They could have a 7 on the basis that if their teacher believes they would have been capable of achieving a 7 if they had had normal teaching. We are here debating whether whole swathes of the syllabus should be ignored, so you get a 9 marked on half of the syllabus and the rest is ignored.
I do not think that serves children well.
They will go into courses designed assuming prior knowledge which they will not have. Yes, we can in theory lengthen, say, the A-level or foundation years to catch up but I don't see this being argued for.
What I am seeing is an assumption that somehow during the two years of A-level chemistry they will manage to first teach parts of GCSE chemistry while still managing to get the pupils through the A-level material in time after that. Same for foundation years and first years at uni, they will somehow manage to cram in teaching A-level too.
Why?
Why not let students continue to study and take real exams (or modules as a SE13Mummy suggests) as and when ready?
Thus the exams will continue to have meaning in the world. The students will progress at the right level of knowledge. Thus the chance of them succeeding in life is increased.
I think this fake GCSE process will be damaging to the children who need to know the material and use it in their lives. I feel it is educators / government copping out of making sure the children get the education for real.