advice on arfken - mathematical methods

Hi i am entering my undergrad in physics and have done a lot of physics olympiad stuff so i am familiar with the typical undergrasd physics books. For the math i finished a bit of mit ocw for the calculus and lin algebra. was looking into arfken and just wondered is it like meant to be done chapterwise ? cus i would like to read stuff liek fourier analyis and legendre polynomials which show up when dealing with potential functions in ch3 of griffiths. So should i be doing it chapterwise or can i shoot at random