how can i change my major

<p>I'm going to be a senior this year and I'm extremly stressed out for college. Is it good to pick an easy major just to get in and change it later on?
The college i want to get into is UCI and i hear public health is really easy to get into but i would like to change it to pre-med, biology once i get in.My grades are average not the worst and not the best. Is this possible? </p>

<p>How long after can i change it?</p>

<p>PLEASE HELP.</p>

<p>p.s. the school of my choice is UCI so any information regarding it would be great.</p>