What type of job are you expecting to get without any A-Levels? A number of my fellow University graduates are getting sweet
all, not even basic jobs.
Even becoming a plumber, joiner etc. requires you to do a college course.
Will A-levels make you a better pilot? Hell no, I'm sure there are a number of pilots out there with no qualifications at all. The problem is that there are very few jobs these days that require little to no qualifications. Most people have at least a couple of A-Levels these days so you're going to end up putting yourself to a disadvantage.
Work hard and you won't fail, sit and moan about failing and you will fail.
I worked two jobs (one of which was voluntary) while studying my degree and got my PPL completed, so it is possible.