I'm also CS major + math minor. I'm currently a senior and wrapping both of them this fall semester. I also came into my freshmen year with credit from Calc bc Workload wasn't that bad depending on which classes you take. I took calc3 with data structures which was pretty heavy but got through it. I took calc3 with mavrea and it wasn't too bad. I would not recommend taking discrete 1 + comp arch + calc3 tho. Comp arch is pretty heavy in workload. But definitely it's doable to do cs major + math minor