<p>@hoihoihoi
Please refrain from using abusive language. Let me just explain to you how math and science works. You learn the prerequisites in detail and then move on to further subjects. There is absolutely no such thing as a frivolous understanding of any sub-discipline in maths and science. Nonetheless, I have no interest in arguing for you - it’s a waste of my time and yours and hereafter I shall not reply, so there is no need for you to do it either. Good luck at any university you applied to.</p>