<p>@alwaysleah, only if the Subject Test is after. Studies have shown that the top way people learn things is taking a real test with pressure, the AP test, it helps you learn bio even better not to mention all the studying before it. The AP test has many things that are not on the Subject Test so you would be wasting your time studying some stuff before the subject test. You shouldn’t forget your extensive studying and year of learning in 4 weeks.</p>