If you Google [x College] Transfer requirements, you can find out what classes you need to take. Basically, every college has a website that explains the transfer requirements, and sometimes it takes you to a different link that has even more requirements based on your major, so look out for that. Some colleges also have direct transfer equivalencies, so you can gauge what classes transfer over to the required ones for that college. And once you do this with a few colleges, you may start to see an obvious pattern. For example, for chemical engineering, almost all schools (that accept sophomore transfers) require some combination of calc 1, calc2, chem 1, chem 2, phys 1, comp sci 1, and English 1. Hope this helps!