<p>Hi everyone,</p>
<p>I signed up for the Jan SAT and realised I should be going for 3 subject tests instead of just 2. I'm currently taking chemistry and physics and wish to add a math2. Is it possible for me to just add the math test on the test-day itself? How would the billing work? Should I call the test-center beforehand to make sure? </p>
<p>I don't want to burn the midnight oil during the meantime studying math for nothing, haha. Can anyone help?</p>