Original post by artful_loungerIf you aren't going to enjoy those A-levels, you definitely aren't going to enjoy the degree, and you aren't realistically going to enjoy the role after graduating. So it won't "pay back and be better later" - it's just more of the same. More specific, more detailed, and more applied, but still the same.
It's not uncommon for students to not know what they want to pursue necessarily at your age - I think it's rarer for them to have any great clarity in this area. However, in general the best way to maximise your options for when you later apply to uni is to take similar subjects to those to begin with.
Most non-STEM subjects will accept an applicant with a STEM subject profile if they can demonstrate commitment to the course, for example Law or Economics. There aren't many courses that require non-STEM subjects as prerequisites; normally History, Languages, English and visual/performing arts subjects. I would note the latter does not necessarily include Architecture, and there are some courses that don't require Art A-level, although you will usually be required to demonstrate some artistic skill otherwise.
Some Chemical Engineering courses will only require Maths plus either Physics or Chemistry (more commonly the former than the latter) and teach you the one you're "missing" in first year. Thus you could take e.g. Maths, Physics, and Art, which would be suitable for any engineering course, those Chemical Engineering courses that are as described above, and any Architecture course (as well as, of course, anything that don't necessarily have specific subject requirements - Law, Economics, Geography, etc, etc).
But taking only a single science isn't going to achieve anything, unless that science is Maths (and even that would still hugely limit you to Economics and some CS/Maths courses mainly, and be suitable for some architecture courses). Taking two is ok, but three is usually better. Students often think a "split" portolio of a STEM subject, an essay subject, and another is the most flexible, but in reality it is the least flexible. It's perfect, for say, architecture, if you take an essay subject, art, and maths (or maybe physics at a stretch). It's probably the poorest preparation for any other subject or subjects you could want to study, including those subjects individually (particularly as for "academic" subjects such as law, non-academic subjects like Art are considered non-preferred, because they don't actually do anything to prepare you for the academically rigorous study once you get to university).
However, choosing your subjects, and indeed your degree, based on it getting you a "reliable" job/career is probably the worst thing you can do - for yourself. Take it from me - I did this and left my engineering degree halfway through because I hated it, and I had only chosen that subject because I was reasonably good at maths and sciences (despite having studied mostly non-science subjects in IB) and I was confident it would lead me to a "reliable" career. But it wasn't until partway through that I finally realised that, I would just be doing this same stuff I hated, day in and out, in that reliable career.
If that's your only long term goal, you would be better off pursuing an apprenticeship in accounting or something - it's a fairly stable, avoids any excess academic requirements, and decently paid. Whether this is what you want, I can't say. I suspect not, but...
Don't pursue Law, or engineering or anything else, because it's a "good" career. Pursue them because you have some genuine interest in the fundamental content and skills required - if you like researching complex rules, analyzing arguments, or have a strong sense of social justice, law is probably not a bad option. If you like doing science, using experimental methods to research develop new ways of doing things, and applying "basic science" principles to improving the efficiency of existing methods using such though processes then engineering (including chemical engineering, and including cosmetic formulation) is probably something you'll enjoy. If you don't enjoy the skills used in those professions, you don't enjoy learning the background theory required to pursue those professions, and in any measurable way don't want to pursue them other than having a good paycheque, then it's not a good profession for you.
You don't need to earn 6 figures to live comfortably and securely, and in fact you can earn far less than that and live not so securely but still have much greater life satisfaction than someone who does.