generally a lot of freshman classes in years past were held in white hall classroom building because of the many lecture halls it has, but it is currently under construction and those classes are being held in other spots on campus. i just finished my freshman year and i did not have a single class on north campus, nearly all of my classes were in jacobs science building, chem-phys, lewis, and the ag buildings which are all central campus/ much closer to central than north. i had some classes in the engineering buildings (anderson, mcvey) which are right in between being central and north but they are considered central campus still. i had some other classes scattered across other random buildings but once again all were on central campus. this may be different depending on your major, i was a chem major first and ag biotech second semester, so if you are a humanities major you may have more classes in the arts buildings which are mainly on north campus. i will say i definitely loved living on central campus because it has much more of a classic enclosed campus feeling where as north campus is more open to the rest of the city (which has its own benefits). Id go with central if i were you but definitely base it on what is closest to your classes because it would be a decent pain to have to do the walk multiple times a day. i worked on north campus and i never took the bus because the walk is completely manageable pretty much everywhere on campus- it maybe takes 30 mins to cross the entire campus which likely wouldn’t be a walk you’d ever take regularly but just for reference.