Hi Gbvsf,
I think the proverbial candidate with A-Levels in mickey mouse subjects will not last long in the process! Do you have a degree? The CTC website says that a degree can be used if you do not meet the GCSE or A-Level requirements.
My gut feel is that graduates will be preferred here - I have seen it at other selections for airline schemes where very few 17-19 year-olds made it anywhere near the final stages.