I would like to apply for aircrew but I don't have the right qualifications to do so that's why I'm trying to find other routes
Don't join, get the quals! Go to college, bang out 3 GCSEs (Ma, Phys and Eng) in one year- apply. Make sure you make a point of saying that when you made the decision to be a wsop, you decided that nothing was going to stand in your way. That softens your poor school performance a little, and underlines your determination.
If that fails, be an erk!
The RAF is shrinking. I predict it will get harder to trade hop- especially when you are actually very well qualified in a trade.
CG