Cliffs AP biology book 3rd vs 4 th edition

[ppflow]

What should I use ? Is there that much difference ? 3rd edition has 6 full length tests whereas 4th has only 2. Which one should I get ?

Thanks

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[ppflow]

Also 3rd edition has CD whereas 4 doesn't

 

[MedDevil]

http://forums.studentdoctor.net/threads/cliffs-ap-biology.996948/#post-13906842