<p>I’m sorry I can’t answer any of your other questions, but I know about 4.
It is NOT easy to transfer into UCSD’s bioengineering program. Or it’s aerospace or mechanical program. I asked as I wanted that major myself, and they told me at open house they only take TEN students into that program a year, after the original admits, ranked by GPA. D: That was a blow for me. You would have to apply at the end of your freshmen year.
But the other engineering majors are all open. Best of luck deciding!</p>