I'm currently in my final year of A-Levels and I plan to go to university outside of the UK but I have no clue how I would go about this, and my school only seem to help with UK university applications.
I want to study computer science in Sweden, so if anyone with experience can advise me or direct me to the right websites it would be much appreciated.
Your first port of call is here: https://studyinsweden.se, there is lots of information there about studying and living in Sweden. You can search for a list of English-taught degrees by clicking 'Programmes' at the top. Also check out the International Study forum.
I think you should also consider Germany. Like in Sweden, university is free, but the cost of living is much lower. https://www.study-in.de/en