Use the summer to think about what you want from life. Most things, yes, require GCSEs. It is most likely that you will have a miserable job otherwise. Anyone can pass GCSEs if they work for it. No ones asking you to be a genius for the most part you just have to regurgitate information. But it will take time, especially if you're already weak. Go back over your years work and learn it before september. If you want this, you will have to make sacrifices with your time. The easiest way to look at it is to do each piece of work you are set to the best of your ability - and always aim for perfection. These exams are not difficult, you just have to learn how to remember information. But do look at other options, perhaps non-academically. But every path you consider will have resistance that you must learn to overcome.