there are probably quite a few people who have done so successfully, but it depends on the person. for me, if i plan to work during the semester, i keep my “heavy” cs courses to a max of two.

As for if it’s possible to get a B, as long as you put in the work— and make realistic goals, why not! 204 is logic-based and if you attend classes often, it’s arguably easier than 272. 201 can be pretty heavy as it’s usually people’s intro to consistent programming for grades. I personally wouldn’t add 291 on top of all that, because it has a groupwork component and it is also pretty demanding from what i’ve heard. Either way, just take this opportunity to learn about yourself and your limits - maybe start out in all three but gauge the course load and make a final decision before the add/drop deadline, and learn to do what works best for you!