While the idea of taking Calc II over winter is sound advice, I’m not so sure I would take it at another school, even if credits do transfer. Any other subject, or if he was in a different major, no problem. But math is critical to comp sci, and, IMHO, I think he would be better off in the long run if he took the class at Maryland. I could be wrong, but I think it will help him to learn how to handle the rigor of classes at Maryland, especially foundation courses that are integral to his major. This is only the first semester, and no question that it’s an adjustment period all around in many ways. Calc II is a really tough class, no question. So, he learned a valuable lesson about study decisions that he will hopefully not repeat. Sometimes you have to fall and scrape your knee in order to learn how to balance on your bike correctly.
Is he aware of ourumd.com to check out comments on professors? Some are better than others…obviously, take everything with a grain of salt because comments are typically written by highly motivated students (sometimes highly motivated by the opportunity to get revenge against a prof with a bad review!). However, most reviews are helpful and give you a sense of workload, quirks, things to look out for. Not all profs have reviews, but if they do, it does help you decide which section to sign up for.
While you expressed frustration of a CS major not being able to take a CS class his second semester, which I can appreciate, he is fortunate that he did start ahead of the game in classes (assuming he placed out of 131). This means that even though he can’t take a CS class next semester, he has NOT lost any time in his overall 4 year plan for graduation! It’s not putting him behind, so honestly, no sweat.
Instead, look at it as an opportunity to take other university requirements to get them out of the way sooner. As he gets further along in his major, it will be harder to schedule the gen eds that are of interest to him because the classes for his major will only be offered at certain times. So, it’s not really so bad taking all gen eds with just the math as the challenging class (NOT implying gen eds are not challenging as well, especially if there is a lot of writing involved, but just that there is just a little more freedom of choice for gen eds - choose your own poison, so to speak).
Hope this helps. I know, it’s not ideal, but it is only a bump. He will be fine. If you want to look into the adviser issue, it can’t hurt to call to ask. I really think individual advisers are assigned once students are just a little further along, but I couldn’t say whether that’s next semester or next year.