Practice Tests for US History/Biology

<p>Is it worth it to buy a prep book for these tests with just 2.5 weeks until the exam? If so, which ones do you recommend?
I was thinking of getting some released practice tests instead as I’m already taking AP Bio/USH. Does anyone know where I could get some PDFs of these? </p>

<p>Thanks. </p>

<p>BUMP</p>

<p>Need some USH practice tests too.</p>