Just to key in people that mightr be confused here- Ena is not currently going to University. Americans normally call University 'College' but we don't; Ena is asking about 16-18 education. That's why she doesn;t appear to be working towards anything- she's not actually taking a degree.
Ena- other than getting an ECDL, I don't know what to tell you. There's no real necessity to go to Uni unless you are REALLY determined to get a degree.
In general, get core subjects that interest employers. You are already doing Maths again- but if that doesn't work out, I recommend getting a Numeracy qualification. That's all employers want and they are much less hassle to do. Maths is only needed if you are thinking of taking numbers seriously, which it is apparent you are not.
Other than that, English and computing are good, but an ECDL covers the computer angle. Anything else that seems straightforwardly academic is never bad- History, for example.
Thern, when you have had time to think, find a vocation that vaguely interests you and get qualified for it. Even if you don't go into it, it will pile up the work-based skills you are acquiring that make you a lot more employable. They are normally quite social as well.