I felt the exact opposite for general chem. I thought that was the one thing Kaplan's book did a decent job of teaching. The big thing is not just reading it, and finding practice problems to apply what they are writing. If you have access to one of the Kaplan white books with the practice problems, those are outstanding for practicing chemistry problems. One area that Kaplan does need to address for general chem is maybe some lab stuff. I had a lab type question on my chem section that caught me off guard, and looking back it was very easy, but I just hadn't reviewed it.
In regards to the balance, I didn't really notice that in the Kaplan book. The fundamental chemistry stuff (Lewis Dot's, radius size, energy of ionization, etc.) has so much stuff that you can be tested on. You should know the fundamentals very well. Electron orbitals, enthalpy of reactions, etc. I thought it was probably more from Chemistry 1 than 2 if anything, but I'm sure it varies.