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<p>You need to investigate each school’s policies on declaring or changing major to an engineering major after enrolling.</p>
<p>For example, at Berkeley, if you enter as undeclared in the College of Engineering, then you can freely declare any College of Engineering major in your first year. But if you are undeclared in a different division, like the College of Letters and Science, changing to a College of Engineering major is very difficult. But also note that undeclared in the College of Engineering may be more selective for frosh admission than many declared College of Engineering majors.</p>