<p>For my SAT subject tests I'm taking Math II and Biology, because I intended to go into a biology-related major. However, recently I also thought about going into mechanical engineering.</p>
<p>Will not taking the SAT Physics test have a negative impact on my admission chances if I do decide to major in mechanical engineering, or will a presence of another science test (Biology) be enough?</p>
<p>Biology will be enough, unless you are applying to MIT. Come to think of it, even for MIT, biology will be enough. I think they only ask for 2 tests, and Math II and Biology are certainly a good combination.</p>
<p>If you’re applying to MIT, you only need one math and one science subject test.</p>
<p>Besides, it doesn’t really matter. Lots of people change their minds on what major they want during freshman year anyway.</p>