<p>I won't be able to take AP Chemistry or AP Bio before I'm supposed to take the SAT Subject Tests for them. I plan to become an engineer of some sort and I feel that I need to take these subject tests. Is it absolutely necessary for me to take AP Chem or Bio before them or are the honors courses sufficient enough. Also, I'm not really sure when's the latest I can take my subject tests. Can someone please help? I need to know as much about these subjects tests as possible.</p>