If you are working through the Exam to get ahead on your Exam Revisions, note that Problem Solving question 1 has major issues with boundary conditions. In the original version, the boundary condition should only have been y(1) = 0, and it would have been fine; in retrospect, that is what I should have done on the exam. In the corrected version I updated during the exam, there’s also a problem with the boundary conditions; I had meant to correct it to look just like the version on the practice exam but failed to do so. So in terms of assessment, I only checked up to the part where you would have applied boundary conditions.