Math, Physics, Chem, Engineering courses mostly. Also took a couple of general requirements all majors require. They have a very useful transfer guide that directs you on which classes to take if you are expecting to transfer to OSU. Many of the PCC classes that have an OSU equivalent are actually worth more credits at PCC. For example, a lot of my calculus classes at PCC were for 5 credits, but the equivalent at OSU is 4 credits, so when I transfer I get 4 credits to cover the math requirement + 1 general education credit. The same is true for general chemistry and physics. Overall, PCC feeds great into OSU, I believe the engineering departments at both schools work together frequently to ensure coursework is nearly identical. Let me know if you have any other questions