Collegeboard official guides question

Test Preparation SAT Subject Test Preparation
1

<p><a href="http://www.amazon.com/Official-Study-Guide-Subject-Tests/dp/0874477565/ref=cm_lm_fullview_prod_9/104-1728141-5066306?ie=UTF8%5B/url%5D"&gt;http://www.amazon.com/Official-Study-Guide-Subject-Tests/dp/0874477565/ref=cm_lm_fullview_prod_9/104-1728141-5066306?ie=UTF8&lt;/a&gt;&lt;/p>

<p><a href="http://www.amazon.com/Official-Subject-Tests-History-World/dp/0874477697/ref=cm_lm_fullview_prod_10/104-1728141-5066306?ie=UTF8%5B/url%5D"&gt;http://www.amazon.com/Official-Subject-Tests-History-World/dp/0874477697/ref=cm_lm_fullview_prod_10/104-1728141-5066306?ie=UTF8&lt;/a&gt;&lt;/p>

<p><a href="http://www.amazon.com/Official-Subject-Tests-Mathematics-Levels/dp/0874477727/ref=cm_lm_fullview_prod_11/104-1728141-5066306?ie=UTF8%5B/url%5D"&gt;http://www.amazon.com/Official-Subject-Tests-Mathematics-Levels/dp/0874477727/ref=cm_lm_fullview_prod_11/104-1728141-5066306?ie=UTF8&lt;/a&gt;&lt;/p>

<p>The Official Study Guide for All Sat Subject Tests, The Official SAT Subject Tests in U.S. History and World History, and The Official Sat Subject Tests in Mathematics Levels 1 & 2</p>

<p>do the tests in this book overlap like are they the same ones? like the specific books have 2 tests each, while the official real one only has 1 of each.</p>