I went back to Uni this year after quitting school at 15! I'm now 22 the essays you get a hang of, as pp said with learning centres who proof read etc you will be fine!
I have applied for nursing next year as that was my original plan. I'm hiring a tutor to get my maths upto scratch. I wish I did the foundation studies but I don't really want to waist time now
Good luck and you will make lots of friends on or off campus!!!!