what's the key point for USH?

<p>I am a student in China and know nothing about USH. I still want to have a try in Nov.(I already have 3 tests all 750+, so I take this test just to help me know more about USH and probably help me in my Freshman year since I heard that students are required to take history in many universities despite their major). And I want to make this shot worth and I’ll do my best anyway. So I think it’ll be better if I put relatively more effort to certain key point and start working from those chapters. I’d appreciate your help!</p>