this might sound outlandish but you know what i would do? just skip studying that section all together.
at most, you MIGHt get like two questions about solubility on the DAT. even then, they'd be like really easy ones. if you can get a study guide like Destroyer, then just go over the solubility questions in it and know those well, then move on to another subject.
one of the things that took me forever to learn was not to just dwell on just one subject forever.
the way the DAT is set up is that you don't need an in-depth knowledge of one of two subjects. what you DO need is a broad, shallower knowledge of a wide range of subjects. having a deeper knowledge of certain subjects is good (and thats what i tend to do) but not necessary for success on the DAT.