Hi, I am an international student in UCSD with F1 visa. I plan to have a one-day trip to Tijuana in weekday. Will I have any trouble when I re-entry the USA for that I don't study at campus but have a trip?
There are many things you must consider for re-entry into the USA after travel under an F1 visa.
I highly recommend consulting a Designated School Official at your international students office on UCSD campus.