Wow, p-chem in the summer sounds rough; how long is the term?
I don't know if you are taking the quantum or thermo part but I always found it useful to categorize information. For example, in thermo., you can organize by state function. For each state function put the definition(s), total differential, and equations for calculating the change in that state function for specific cases. You can do this for other topics (equilibrium, partition functions, etc.)
For quantum, I organized everything by "problem" (e.g. Particle in a Box, Harmonic Oscillator, etc.) Then I listed the Hamiltonian, eigenfunction form, eigenvalues (energies), boundary conditions, and any other important notes.
The nice thing about this is when I worked on problems, it was very easy to find the equations I needed. I also had instant cheat sheets (when permitted) for exams.
Good luck