I think niallcooney has hit the proverbial nail on the head
On my ground school course there were guys with degrees who were toiling. On the other hand there were those of us with few or no A levels who found the ATPLS a breeze (ish). Why, because they were common sense and relevant to what we wanted to do in life (I exclude air law!!!).
I am in my second flying job now at 23 no-one has asked about the grade of my A levels let alone whether I have them!!
As has been said before, it’s down to hours, where and how you trained and, most of all, perseverance.
Having said all that if you can get you’re A levels,... go for them.
If however you have spent the last couple of years wondering why they teach such rubbish and have no hope of catching up, all is not lost…but you will have to work bloody hard!!!
Good luck