/sci/ - Science & Math

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So, I've got the Differential Equations Revision Final in September 20th, but I'm pretty clueless about it. I didn't have enough time to study it during the semester, so I just did a speedrun of the whole curriculum and ended up scoring a 2/10 during the June final. Anyway, you can take the final as many times as you want here, until you pass, so I'm taking it again during September's Revision Period

Problem is, I remember little, and the subject confused me a bit. I have no notes (long story short I don't go to class,and most of the time, neither do the proffs) and I have only one book: William E Boyce Elementary Differential Equations Solutions

Does anyone have any tips or any other books I could buy? I took the majority of the "classes" that were under the Dif.Eq. Branch over at Khan Academy as well.