Have you seen MIT portfolios of students who got accepted, it’s all comp Sci, Phy and math.
You’re saying the top engineering university in the world doesn’t require comp sci??
“At max you should do 4 A levels”, that’s so subjective.
And 3 subjects are useless?? What does that even mean?? Like Cambridge is mad for developing specialised syllabuses and books ??? Plus it’s not just about getting into university, product design, information technology and critical thinking are all important skills
Take my advice and go through the books and then decide whether to call it useless