I'm new admitted student @ Cal Poly SLO this fall and I have this plan which is transferring to UCB, UCLA or UCSD in the future. My major is Applied Mathematics and I want to change it to some Engineering major after I finish my first academic term. Is it possible to transfer to those UCs? When is the best time (Freshman, Sophomore, Junior, etc...?) to do transferring? What can I do for the transferring?