Can I choose more than 3 subjects in the Sub-honours years in St. Andrews?

I am planning to study for an undergraduate degree at the University of St. Andrews. I am aware that the students in St. Andrews could choose 3 subjects in the first and second year. Therefore, I am wondering could I choose 4 or even 5 subjects?

To be fair, you could do more than 3 if you dropped one early. For example, on top of my degree (computer science and economics) I also took a module in geography in first semester and a module in maths (which counted toward my econ degree) in second semester. So I took four different subjects. But I only was allowed to choose between computer science, economics, and maths to continue in second year, because I hadn't taken enough geography modules in first year to continue it. If I'd dropped both maths and economics, I could have taken first-year modules in something else (say, philosophy) in second year. But I would have then only been able to do computer science in honours, since I wouldn't have the second-year requirements for anything else.

Is there a way to do a joint degree if you only started one of the subjects in year 2? For example, if in year 2 you started a course that offers direct entry to second year (https://www.st-andrews.ac.uk/subjects/study-options/ug/degree-routes/direct-entry/), do you think that you would be able to graduate with that as part of a joint degree even though you didn't study it in first year?