@aashleypng I would recommend you take an art foundation course at a further education college. That will give you experience of a range of approaches and disciplines, will increase your UCAS points, and most importantly you would experience studio culture and critique before you start architecture. You can apply for an art foundation and to UCAS for architecture courses (note, an art foundation is not the same as the foundation degrees/ ‘year zero’ offered by a lot of universities) so you can try for both.
You don’t have to formally study an art subject to develop a portfolio/ apply for architecture. If you want to do this independently then my tips are:
find a life drawing class - life drawing is not easy but it will improve your drawing like nothing else can, and it is the best demonstration of eye-brain-hand coordination,
a pocket-sized sketchbook - for architects sketching is a way to understand why something interests you/ how it works, not (only) what it looks like,
Drawing/ painting from photographs is OK but
in addition to drawing from life,
use a soft pencil, graphite stick, or Sharpie (which will force you to draw confidently) and draw big!
You will want to show that you are interested in architecture - but don’t try to design a building (you don’t go to a restaurant and insist on telling the chef how you boil an egg!) Think about how you might demonstrate 3D thinking
and making. (Personally I really like to see portfolios from textiles courses - taking something 1D and making it 2D, taking something 2D and making something 3D. Architectural design is essentially
spatial / void rather than volume / solid, so I think textiles are the closest you can get to studying architecture before studying Architecture in the UK.) We will want to see your thought processes (and how you approach a ‘problem’).
I’d recommend the CSM Foundation book for projects you can do (and a lot of these are quite spatial)
https://www.arts.ac.uk/colleges/central-saint-martins/stories/central-saint-martins-foundation-bookAlso look at the websites for the courses you are interested in - most will have recommendations and submission/ format requirements for portfolios.
(The RIBA Validated UK architecture courses are listed here:
https://www.architecture.com/education-cpd-and-careers/riba-validation/riba-validated-schools-uk and you can see the best projects from the final years of the RIBA Validated courses globally can be viewed here:
http://www.presidentsmedals.com)