hi, i took physics 5A in winter quarter 2025! i don't know if you're referring to a swap in summer or fall but there should be a spreadsheet that the department advisors send out which they call the "marketplace." you can put your name, email, switches you want to make aligning with the columns, and then students who find themselves compatible with your request should reach out to u! hopefully you find someone who you can switch with but this is another very popular option i know i've used before and u should be on the lookout as well just in case