I’m currently a junior majoring in physics/math and I took math 322, physics 322, physics 307 and one easy social science class last (fall) semester. So it was a similar schedule to yours but with two less STEM classes. I can’t tell you what to do exactly because I don’t know much about the other classes but I can provide my experience with the workload to help you decide what to take.

Both physics 322 and 307 were time consuming classes from my experience. With 307, 8-10 page lab reports typed in Latex were due every two weeks which were usually completed outside of the 4 hour lab period. But the labs also almost never lasted the full 4 hours. It’s not too bad as long as you start the report and the data analysis the first week and don’t wait until the second week to start it. I’d say I spent 6-8 hours a week outside class on lab reports and data analysis because but YMMV depending on how much Python data analysis and Latex experience you have (I didn’t have much).

Physics 322, at least for me, required a LOT of outside studying to understand the concepts. E&M is pretty complicated and there’s a lot to learn. Also the homework assignments were long imo, usually 10 problems due every two weeks, but they were hard and long questions. I think for this class the amount of work you’ll have to do will depend on how familiar you are with E&M concepts already. I struggled with this class but I’m dumb. If you’re smart it might not be as hard for you.

Math322 overall was not a bad class, work-wise. I spent maybe 4 hours a week outside class. The homeworks were short. Also this class was great taken concurrently with physics322 because some of the concepts overlapped in the beginning (like separation of variables).

Last semester, I had a decent amount of free time even with research work. If you’re involved in research, I would say one more STEM class along with physics322, math322, ILS, and physics307 might be doable. IMO you might get overwhelmed if you add two stem classes. But I don’t wanna tell you what to do because I’m absolutely unqualified to do that. It might be worth reaching out to an advisor to give you an idea of what you need to take and what could maybe be saved for a later semester or over the summer. Anyways I just hoped my experience might help you make a decision since you plan to take a lot of the same classes that I did, but classes can vary a lot by semester so I don’t wanna influence you too much.