113A with Neuhauser was tough. His lectures aren't very clear, but he posts lecture notes that are fairly easy to understand. The tricky part about this course, however, is that he doesn't really prepare you well for whats going to be on the exam. The homework sets are often a good source for a few of the problems. Be sure to go to discussion sections because the TA's actually do example problems (which Neuhauser never does), and they are the other good source to study for exams. Neuhauser is actually a nice guy, and seems invested in our learning, he just doesn't convey the material very well.

If you're going to take 113A with Dr. Neuhauser, make sure you understand the following topics: photoelectric effect (along with all the relevant equations), the Rydberg formula derivation, operators and how they produce eigenvalues, potential wells, harmonic oscillators and the derivation for harmonic energy levels (includes raising and lowering operators), commutators (very important), the Schrödinger Equation (and its derivations for time-dependent and time-independent), expectation value and probability calculations, angular momentum operators (L), perturbation theory, and variational principle. If you genuinely understand these concepts, you'll pass with a decent grade. Dr. Neuhauser's lectures are not very helpful, but the homework sets are a great study tool. Use his notes to understand the derivations. The hardest part about this class is figuring out how to prepare for his exams, but overall they were very fair and the averages were in the D range.
Dr. Neuhauser doesn't get the credit he deserves. This is a challenging course regardless of who your professor is, but he is always willing to help his students and encourages them to come to office hours. I definitely felt lost the first half of this class, but by the end, I understood how everything came together and it all made sense. Don't be afraid to take this class with Neuhauser. It is very doable.