As stated, I need to change the spacing between the top of the page, the chapter name and title. I'm currently using \allsectionfont{\centering \fontsize{15}{15}\selectfont} to control the size and where they are placed. There is still a huge gap between where it says "Chapter 1" and the top of the page, as well as a gap between "Chapter 1" and the name of the chapter. How can I make this gap vanish?

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