I'm confused about clep study material?

I will be taking the clep exam for US history 2, and I purchased the us history 2 cliff notes and instantcert, they both are the same. Which one should I use to study? I think the instantcert.com is a great review, and you are using flash cards which really helps me a lot. Has anyone used instantcert alone to study for us history 2? Thanks

 

What I found helpful was to go to the local community college bookstore, and buy a used text for the relevant class. For example, get the text used for US History II, and you'll have a good review reference.

 

I passed US History 1 clep exam last year with just instantcert and the official clep study guide. Instantcert really works for me beacuse it helps me reinforce the material, I thought US history 2 cliff notes would be a supplement, but it is the same thing.