That's what libraries are for. Just about every book is worth a look... you preview itand decide if you think you'll find anything worthwile in it, then you can photoread and postview it. Then borrow it if you want more or leave it if you don't... you'll have gathered a lot of information about the subject in this way too.

It helps if you talk to the teachers to discuss the core of your subjects to get more information from them. Ask the teachers what they read and are reading, that will give you an insight to what they are focused on.

Also the bookself in a good bookshop will give you some insight of what is being taught in the local schools.

Alex