What Skyhigher says is true, but that's not to say it isn't worth doing them...your plans may change over the next few years so the better qualifications you have it will at least demonstrate you have the ability to learn and spit information out when you need to and give you options further down the line. At 19 there is no rush at all.
For what it is worth i left school with 4 GCSE's, no A'Levels so don't get fixated on it. The way the industry is you'll need a decent job first to pay the £85k it is going to cost you!!!!!
Best of luck
