How hard would HDDA be in the Summer without iCDA/CDA?

Hey everyone, I'm planning to take HDDA in the summer. I haven't taken iCDA or CDA yet, but I'm finishing iAM this semester with an A and taking ML4T next semester and plan to switch to OMSCS in the Fall

I've seen in some posts that HDDA is usually considered a continuation of CDA, so I'm wondering first if this is true and second how much of a challenge it would be to take HDDA without that background

Also in your opinion, would Bayes or Sim be more valuable than HDDA for someone aiming for a DS or MLE role?

Thank you!