Starting sixth form, how can I get into Cambridge computer science?

I have only just completed my GCSE's and I'm predicted to get all nines. I have chosen the A level options : Maths, Further Maths, Computer Science and Physics. I have to choose 4 to take Further Maths as my school does a level maths and further maths each in one year, which I don't get. I want to get into Cambridge for computer science or either ICL software engineering. I do currently have a passion for computer science, I have started a business where I repair broken iPhones and resell them. I have also done some coding in GCSEs and enjoyed that. What should I do from now to prepare myself and stand out?

In year 12, you will cover all of the A Level Maths content and sit the A Level.
In year 13, you will be doing further maths, computer science and physics A Levels.
https://www.undergraduate.study.cam.ac.uk/courses/computer-science
Firstly, revise for the Test of Mathematics for University Admission (TMUA), as it is an entrance exam, to shortlist for interview.
Secondly, do things for your personal statement.
Your super curricular, extra curricular to show off your passion. For example, your own coding projects…
Reading computer science article, https://www.nature.com/subjects/computer-science/nature

However, you need the A*A*A so focus on your A Levels. It is the priority. You can take a gap year after year 13 to apply, or apply for 2024.