In need of primer suggestions (quick)...

I have a couple of days off work in just over a week and I plan on taking 5 DANTES exams and 1 CLEP over the two days. Here are the exams I might need primers for:

1) Principles of Public Speaking

2) Technical Writing

3) Environment and Humanity

4) Introduction to Educational Psychology

I would like to spend as little money as possible for study material. Between proctoring fees and exam costs, I will be broke as it is.

Thank you,
Chris