Changing from science to world history?

<p>So I registered biology and maths 2 for the december exams but I’m not sure about biology because its a lot harder than I thought, so I tried studying physics and I realise theres no way I can teach myself all that in just 22 days. So can I take world history instead? Which prep book should I use? I need at least a 750+
Are there any online resources I can look at?</p>

<p>P.S. I’m and international student if that matters.</p>

<p>When you show up you can just take history instead of science.</p>