Got back my DE test 2

Surprised that my mark is pretty good, even though I really did mess it up. A mystery to me on how I can get that kind of result (but v v grateful though). Look at my paper and I answered like a drunk person (e.g. my working is correct, but I gave a different answer...forgetting to write the general solution, which is a really really stupid mistake). I also write this way a lot: Yp=u1.f1(x)+u2.f2(x) Yup, too many lines canceling my work.