All the equations I recognize are undergrad physics material. You've got the differential version of Maxwell's equations in free space on one page, which would be from an introductory electricity and magnetism course. On several others there's Schrödinger's equation (the ones with the Hamiltonian operator, Ĥ, acting on Ψ, the wave function) from quantum physics. Some others look like something I should recognize from my Complex Analysis class. All this makes sense with the Hawkin's Aid, a study book for a Professional Engineering licensure exam.