Which course is better to do along with an articleship, a B.Com, CS, ICWA, CMA or any other?

Hi, Along with internship, I won't suggest you any course rather I'd suggest you to focus on internship and try to maximize your learning and enhance your skills and knowledge. This internship is going to play a huge role in your professional career hence do utilize it in the best interest of yours

You can choose any finance career to supplement your CA degree. Assuming that you have cleared atleast one group of CA IPCC by now, I would suggest you to pursue and complete B.Com as soon as possible. A Bachelor's degree is a must. Apart from that, it is advisable to pursue CMA (ICWA) or CS bas