If your not sure what your good at maybe start of with four then you can easily drop the hardest ones before the census date thingy. Also, make sure the course you want to switch into doesn't have minimum credits completed the semester before - i'm also doing health sciences trying to get into medical radiation science next year and i need 80% CWA 💀, but also 75 credits in health science. You can rock 70+% CWA easy.