*checks profile* too many people don't specify their age
Well, I went to sixth form and got a lot of trash from one of the tutors there. Unfortunately she taught two of my subjects, and when I dropped one of them, she turned into uber time-of-the-month woman every day. So I stopped turning up for her lessons in the other subject, and then - rather than helping me by putting me in another tutors class - they said I either turn up or I quit, so I quit. Result; my future plans went out the window. There's more to it than that but that was the jist of it.
So I had ~9 months out then went to another college to do a 2 year "programming" BTEC - it turns out during the 9 months I had off college, I had taught myself far more programming than the tutors could ever teach on the BTEC. That's probably why they're tutors in a college, not programmers at IBM. So after 2 years of mind-numbing paperwork, some drugs to keep me happy, and a distinct lack of actual programming, I came out of the course with 240 UCAS point (which is OK, but not to be big headed, a huge underachievement as I know I could do far better). The course wasn't stimulating enough, and to be honest, the fact I was learning with such numpties (minus one guy who pretty much had the same experience as me) really got me down in the dumps. 240 points wasn't enough to get me in to Southampton Uni's Comp Sci course.
If I could wind back time? Either re-take A-Levels at the second college, or go to the highest level at the first college and get my lessons taught with another tutor. Either way, I would take A-Levels if I went back in time.
Right now, you're choosing how you're going to live the rest of your life - and I think A-Levels followed by a degree is certainly the easiest way to earn £50k+ a year. Although my girlfriend's degree (podiatry) has a ceiling of ~£30k/year, hence I'm pushing her to do a different degree afterwards as she wants to do something medical, but you need a degree for everything medical and I don't want her stuck on £30k and regretting it in 20 years time.