If you take the Excelsior Information Literacy on-line course, you will not need any external materials. The course itself will point you toward web sites, articles and other resources, but you probably won't even need them to pass the final exam.

When you register to take the ECE English Composition exam, you will be able to use "MY Access!" which is a very nice on-line writing practice system. I highly recommend taking full advantage of it if you have any doubt of your writing skills.

I'll let others respond about Math resources.