<p>I’d greatly appreciate it if you could answer these questions.</p>
<li><p>How much stock do American unis put on A-Levels? (In other words, is it vital to improve my not-that-great 2050 SAT1 to have a shot at the Ivies?).</p></li>
<li><p>For my SAT Subject tests, is it OK to include World History and US History as separate subjects?</p></li>
<li><p>Am I correct in assuming that you can put down whatever major you want for the unis you’re applying to, and then you undergo a general 2-year liberal arts program followed by specialization in whatever you choose? In that case, is it a good idea to put down the major you are most likely to be accepted for? Does your choice of major influence the likelihood of acceptance? Is so, which majors are the ‘easiest’ to get into (generally)?</p></li>
</ol>
<ol>
<li><p>A-levels matter as much as GPA. Which means it's usually the basis of your application at top schools.</p></li>
<li><p>No, most schools discourage or disallow this practice.</p></li>
<li><p>Every university, heck, different departments, has different policies on declaring majors. Look up those at the schools you are interested in. You can meet the requirements anyway you wish... for example, you could specialise (relatively) during the first few years, and go for breath in the latter half of your education.</p></li>
</ol>
<p>Choice of major usually doesn't affect your application if you're applying to the same college/school within the university. However, different schools/colleges within the same university most probably have different admission requirements. For example, a prospective Sociology major at Harvard College's application would be judged identically to an Economic major's... but someone applying to Cornell's Hotel School may face different requirements from someone applying to Cornell's College of Arts and Sciences.</p>