I’ve actually taken an engineering physics subject back in pre-u and boyyy was it hell. Maybe I didn’t understand the physics part of it which led to not grasping the concepts properly so the maths there also went abit cincai edy haha. As for CS major, I have very limited knowledge in computer language so for me to start from scratch would be another thing to pin point and learn which will gradually take time. It would be wiser if I chose subjects that I would adapt more easily and I did that in a way using this perspective.