Study guide necessary for Research Methods?

[dgreenes]

I did a search on Research Methods which I've pushed off untill the ic cards for it were ready. I noticed a couple of ppl saying that the study guide that comes along with the Experimental Psychology textbook is a very good resource for its glossary and practice tests. I went to barnesandnobles.com and found the cheapest used one for twenty something dollars besides shipping. Any opinions on how necessary or worth it this purchase would be? (I ordered an older edition of the textbook for eight something).