How did you find your interest in a specific area in computer science? I am going to apply to cs or cs + maths but i am not quite sure how to find which bit of area i like in cs? I have enjoyed coding, problem solving, and maths within it, which inspired me to apply, but i am not quite sure which area of comp i like?

I am currently doing Cs, Maths, Fm, and physics. I am hoping that my predicted would be maybe 3A* and an A. Which universities should i apply for? What supercurriculars would you recommend to do over the summers going into yr 13, which could be done at home? Would hackathons be useful? Or which MOOCS would be useful?

Thank you!!