Personally I think that attending a college is better than attending six form in your school because it allows you to an interim between the strictness of the school environment and the freedom of university. The majority of the people I saw go off the rails and over do drinking etc at university were those who went to six forms and hence were not use to being self motivated and just couldn't take the new freedom.
It isn't as simple as that. I stayed on at Sixth Form with some of my friends, and others went to a local seperate Sixth Form college (with a
much better reputation).
Except, that college got such good grades because it gave its pupils less freedom than in high school- case in point being the massive detentions it gave out, or how much teachers were on your back, and so on. As a result, the people there generally worked harder.
Where as my Sixth Form was a lot closer to a university environment- i.e. somewhat less strict than high school- it put a lot of responsibility on you doing the graft and keeping up to date.
Come AS results day, those friends at the college came out with ridiculous grade sets AAAB, AAAA, AABB etc.
But, things flipped around again come A2 results day. Personally, my poor AS results spured me (and other friends) on to get some great A2 grades. Yet at the college, the great AS results had made almost all of my friends complacent, and ultimately underachieve, given the almost perfect platform they had earned at AS. That AAAB for example turned into ABCD.
So freedom at A level isn't straight forward, it is very much swings and roundabouts. I cocked up my AS levels because I wasn't given enough insight into how important they were, nor was I told how much effort was really required to get the top grades compared to GCSE. Now for me, this pushed me to work very well independently at A2, get good grades, and also prepare me for the University environment. Others at my sixth form cocked up both years. And some of my friends at the college did really well for the whole of A levels but didn't do great in the first year of university because they couldn't get round not having people chase them up all the time.
To the OP- like everyone has said, doing system building for the next 50+ years isn't going to get you were you want to be in life. It is a practically skill devoid role, that has little opportunity for advancement. Do your A levels, get some good grades in decent subjects (for example IT and computing?), and then look at your options of a career or further education.